Merge branch 'master' into worktree/stable-snapshot-message-ids-20260730

.agents/notes/implemented/architecture/2026-07-10-single-file-executable-sdk-runtime-distribution.i18n.yaml

@@ -1,6 +1,6 @@
 # Bilingual-pair consistency record (docs/i18n/README.md): the git blob hash of each
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
-#   pnpm run verify-translation-pairing --write
-2026-07-10-single-file-executable-sdk-runtime-distribution.md: 39cfb2999dea7767a18702ad7d160c9e88d7bf20
-2026-07-10-single-file-executable-sdk-runtime-distribution.zh.md: e1a21c40647e1418d4afd02c0bc6b44ef0d4a8cf
+#   pnpm run verify-translation-pairing --write .agents/notes/implemented/architecture/2026-07-10-single-file-executable-sdk-runtime-distribution.md
+2026-07-10-single-file-executable-sdk-runtime-distribution.md: f749d6a72b4c32a189a9f848595076457819d9b9
+2026-07-10-single-file-executable-sdk-runtime-distribution.zh.md: 2b511573bc68e5378279cec8d22ce960af0966e9

.agents/notes/implemented/architecture/2026-07-10-single-file-executable-sdk-runtime-distribution.md

@@ -40,15 +40,15 @@ The deploy root is [`python/sdk-runtime/package.json`](../../../../python/sdk-ru
 
 ### Build pipeline and artifacts
 
-[`scripts/build-exe-for-python-sdk.ts`](../../../../scripts/build-exe-for-python-sdk.ts): runtime closure verification → `pnpm run build` → (after clearing) `pnpm --filter dsh-jsonrpc-agent-pkg deploy --legacy --prod --config.node-linker=hoisted --config.auto-install-peers=false --config.link-workspace-packages=true` **directly into** `python/sdk-runtime/src/deepseek_harness_runtime/runtime/node/` → inject the pkg configuration (`bin` points at `node_modules/@deepseek-ai/dsh-jsonrpc-demo/lib/bin.js` inside the closure, `assets` is a full glob — dynamic import is invisible to pkg's static analysis, so everything must be packed in explicitly) → one `pkg --sea` per target → the executables `dsh-jsonrpc-agent-pkg-<platform>-<arch>` land in `dist-exe/` and are copied back into the runtime directory. CI treats them as intermediate test inputs and retains their platform wheels. All four deploy flags are grounded in measurement: `--legacy` is the mandatory path with inject-workspace-packages off; hoisted yields a zero-symlink file tree (most stable for the pkg VFS, physically guaranteeing a single cordis instance); disabling automatic peer installation keeps unpublished package names from triggering registry resolution; link-workspace-packages points the closure at workspace/vendor sources.
+[`scripts/build-exe-for-python-sdk.ts`](../../../../scripts/build-exe-for-python-sdk.ts): runtime closure verification → `pnpm run build` → (after clearing) `pnpm --filter dsh-jsonrpc-agent-pkg deploy --legacy --prod --config.node-linker=hoisted --config.auto-install-peers=false --config.link-workspace-packages=true` **directly into** `python/sdk-runtime/src/deepseek_harness_runtime/runtime/node/` → inject the pkg configuration (`bin` points at `node_modules/@deepseek-ai/dsh-jsonrpc-demo/lib/bin.js` inside the closure, `assets` is a full glob — dynamic import is invisible to pkg's static analysis, so everything must be packed in explicitly) → stage the target `node-pty` addon → one `pkg --sea` per target → the executables `dsh-jsonrpc-agent-pkg-<platform>-<arch>` land in `dist-exe/` and are copied back into the runtime directory. Linux installs build `pty.node` from source, so the builder copies it from the root install into the staged closure because legacy deploy omits that side-effect directory; macOS uses its target prebuild and emits the required `-spawn-helper` beside the executable. CI treats these products as intermediate test inputs and retains their platform wheels. All four deploy flags are grounded in measurement: `--legacy` is the mandatory path with inject-workspace-packages off; hoisted yields a zero-symlink file tree (most stable for the pkg VFS, physically guaranteeing a single cordis instance); disabling automatic peer installation keeps unpublished package names from triggering registry resolution; link-workspace-packages points the closure at workspace/vendor sources.
 
 CI: [`.github/workflows/build-exe-for-python-sdk.yml`](../../../../.github/workflows/build-exe-for-python-sdk.yml), triggered explicitly only — `workflow_dispatch`, or the `build-exe` label on a pull request; native builds on the three platforms linux-x64 / linux-arm64 (`ubuntu-24.04-arm`) / macos-arm64, with `~/.pkg-cache` cached; macOS ad-hoc signing is handled by pkg. Each leg drives a mock SSE model through the SDK with the default config and a custom `cordis.yml`, drives the exe directly over NDJSON JSON-RPC, verifies the JSONL and final response, and installs release-shaped wheels into a clean venv without `runtime_bin`; Linux additionally inspects GLIBC requirements and runs in a manylinux 2.28 container. A full three-target run retains four artifacts, each containing one release file: the platform-independent SDK wheel and three native runtime wheels; a subset dispatch retains the SDK wheel and selected runtime wheels. Bare executables and source bundles remain intermediate test inputs. [`.gitlab-ci.yml`](../../../../.gitlab-ci.yml) accepts only `python-vX.Y.Z` tag pipelines whose version matches the root `package.json`, builds one SDK wheel and three native runtime wheels, then a single serialized job checks and publishes all four to the project PyPI registry. Windows is a non-goal.
 
 ### Python SDK distribution: two carriers, exe for production, node for development
 
-The Python SDK lives at [`python/`](../../../../python/README.md): `python/sdk` (the client) + `python/sdk-runtime` (the runtime carrier package). The runtime package's data directory holds three kinds of content: the checked-in default `runtime/cordis.yml`, the build-injected platform exe, and the build-injected `runtime/node/` closure tree. `resolve_bundled_launch_args()` automatic resolution **finds the exe only**; the node carrier is enabled only by an explicit `DSH_RUNTIME_MODE=node` (running `runtime/node/node_modules/@deepseek-ai/dsh-jsonrpc-demo/lib/bin.js`, requiring a system node ≥22.19), positioned as the development-verification channel for members of this repo, and does not enter wheel distributions.
+The Python SDK lives at [`python/`](../../../../python/README.md): `python/sdk` (the client) + `python/sdk-runtime` (the runtime carrier package). The runtime package's data directory holds the checked-in default `runtime/cordis.yml`, the build-injected platform exe and optional helper, and the build-injected `runtime/node/` closure tree. `resolve_bundled_launch_args()` automatic resolution **finds the exe only**; the node carrier is enabled only by an explicit `DSH_RUNTIME_MODE=node` (running `runtime/node/node_modules/@deepseek-ai/dsh-jsonrpc-demo/lib/bin.js`, requiring a system node ≥22.19), positioned as the development-verification channel for members of this repo, and does not enter wheel distributions.
 
-[`scripts/build-python-release.py`](../../../../scripts/build-python-release.py) reads the authoritative stable `X.Y.Z` from the repository root `package.json` and stages both packages at that version, with the SDK depending exactly on `deepseek-harness-runtime-bin==X.Y.Z`. An optional `python-vX.Y.Z` release tag is a consistency assertion and is rejected when it differs from the repository version; the source `pyproject.toml` development sentinel never determines a release version. The SDK is a `py3-none-any` wheel; the wheel-only runtime package contains exactly one exe and uses one of `py3-none-manylinux_2_28_x86_64`, `py3-none-manylinux_2_28_aarch64`, or `py3-none-macosx_11_0_arm64`. Its Hatch hook rejects sdists, universal tags, mixed executable payloads, and unsupported platforms.
+[`scripts/build-python-release.py`](../../../../scripts/build-python-release.py) reads the authoritative stable `X.Y.Z` from the repository root `package.json` and stages both packages at that version, with the SDK depending exactly on `deepseek-harness-runtime-bin==X.Y.Z`. An optional `python-vX.Y.Z` release tag is a consistency assertion and is rejected when it differs from the repository version; the source `pyproject.toml` development sentinel never determines a release version. The SDK is a `py3-none-any` wheel; each wheel-only runtime package contains one exe, and the macOS wheel also contains its architecture-matched helper. Runtime wheels use one of `py3-none-manylinux_2_28_x86_64`, `py3-none-manylinux_2_28_aarch64`, or `py3-none-macosx_11_0_arm64`; the Hatch hook rejects sdists, universal tags, mixed-platform payloads, missing or extra helpers, and unsupported platforms.
 
 The exe's "must be explicitly configured" hard semantic is unchanged; the zero-config experience is restored by the wrapper: when the caller gave no `cordis`, named no explicit runtime, and the environment has no `DSH_CORDIS_CONFIG`, the client explicitly injects the checked-in default `cordis.yml` (agent-core + preloaded llm-deepseek + JSONL persistence + bash-local + the `dsh-jsonrpc` serving entry, with `!!js` environment-variable fallbacks) via `DSH_CORDIS_CONFIG`.
 
@@ -62,7 +62,7 @@ The exe's "must be explicitly configured" hard semantic is unchanged; the zero-c
 
 ## Testing
 
-The verification surface has three tiers. Mechanism tier: the measured conclusions for the `--sea` chain are embedded in the Decision sections (ESM dynamic import inside the VFS, single cordis instance, fail-loud config chain, `node:sqlite`, macOS ad-hoc signing runs). SDK tier: the complete keyless pytest suite covers the client protocol against a fake runtime peer, subprocess cleanup, absolute cwd propagation, dual-carrier launch, and carrier resolution; root CI runs it on Python 3.10. End-to-end tier: every platform build completes a turn against a mock endpoint through the default SDK path, a custom config, and the direct binary protocol, with final text and JSONL checked. The custom config additionally drives `run_code` and a zero-agent `workflow` through their real worker files inside the packaged VFS. The same build leg runs a committed executable-specific snapshot through the Python SDK: a keyless scripted model mounts a Cordis plugin that registers a tool, invokes that tool from `run_code`, runs a direct spawn subagent and a workflow that starts a second spawn child, then unmounts the plugin. The comparison normalizes the SDK result and notification stream plus the parent and two child JSONL logs. This harness stays separate from ACP's `pnpm run test:snapshot` because the protocols and build artifacts differ. The platform wheel is then installed in a clean venv and run without `runtime_bin`.
+The verification surface has three tiers. Mechanism tier: the measured conclusions for the `--sea` chain are embedded in the Decision sections (ESM dynamic import inside the VFS, single cordis instance, fail-loud config chain, `node:sqlite`, macOS ad-hoc signing runs). SDK tier: the complete keyless pytest suite covers the client protocol against a fake runtime peer, subprocess cleanup, absolute cwd propagation, dual-carrier launch, and carrier resolution; root CI runs it on Python 3.10. End-to-end tier: every platform build completes a turn against a mock endpoint through the default SDK path, a custom config, and the direct binary protocol, with final text and JSONL checked. The custom config additionally drives `run_code` and a zero-agent `workflow` through their real worker files inside the packaged VFS. The same build leg runs a committed executable-specific snapshot through the Python SDK: a keyless scripted model mounts a Cordis plugin that registers a tool, invokes that tool from `run_code`, runs a direct spawn subagent and a workflow that starts a second spawn child, then unmounts the plugin. The fixture explicitly disables its unused bundled Bash and local skill discovery so its tool set does not depend on repository-external state, and the comparison normalizes opaque message IDs in the SDK result and notification stream plus the parent and two child JSONL logs. This harness stays separate from ACP's `pnpm run test:snapshot` because the protocols and build artifacts differ. The platform wheel is then installed in a clean venv and run without `runtime_bin`.
 
 Manual-driving caveat: the bin treats stdin EOF as "the client is gone" and disposes immediately, so a short-lived pipe aborts an in-flight turn — pipe-driven runs must keep stdin open until the turn ends.
 

.agents/notes/implemented/architecture/2026-07-10-single-file-executable-sdk-runtime-distribution.zh.md

@@ -40,15 +40,15 @@ exe 的 VFS 内是**构建产物形态的真实包树**（各包的 `lib/` + 真
 
 ### 构建管线与产物
 
-[`scripts/build-exe-for-python-sdk.ts`](../../../../scripts/build-exe-for-python-sdk.ts)：运行时闭包校验 → `pnpm run build` →（清空后）`pnpm --filter dsh-jsonrpc-agent-pkg deploy --legacy --prod --config.node-linker=hoisted --config.auto-install-peers=false --config.link-workspace-packages=true` **直接写入** `python/sdk-runtime/src/deepseek_harness_runtime/runtime/node/` → 注入 pkg 配置（`bin` 指向闭包内的 `node_modules/@deepseek-ai/dsh-jsonrpc-demo/lib/bin.js`；`assets` 使用全量 glob，因为动态 `import()` 对 pkg 静态分析不可见，必须显式打入全部内容）→ 每个构建目标调用一次 `pkg --sea` → 可执行文件 `dsh-jsonrpc-agent-pkg-<platform>-<arch>` 写入 `dist-exe/`，并拷回运行时目录。CI 将这些文件作为测试中间输入，只保留对应平台的 wheel 包。四个部署标志都有实测依据：未启用 `inject-workspace-packages` 时必须使用 `--legacy`；`hoisted` 产出无符号链接的文件树（对 pkg VFS 最稳定，并从物理上保证只有一个 Cordis 实例）；关闭对等依赖自动安装可避免未发布包名触发注册表解析；`link-workspace-packages` 让闭包指向工作区/vendor 源码。
+[`scripts/build-exe-for-python-sdk.ts`](../../../../scripts/build-exe-for-python-sdk.ts)：运行时闭包校验 → `pnpm run build` →（清空后）`pnpm --filter dsh-jsonrpc-agent-pkg deploy --legacy --prod --config.node-linker=hoisted --config.auto-install-peers=false --config.link-workspace-packages=true` **直接写入** `python/sdk-runtime/src/deepseek_harness_runtime/runtime/node/` → 注入 pkg 配置（`bin` 指向闭包内的 `node_modules/@deepseek-ai/dsh-jsonrpc-demo/lib/bin.js`；`assets` 使用全量 glob，因为动态 `import()` 对 pkg 静态分析不可见，必须显式打入全部内容）→ 暂存目标平台的 `node-pty` addon → 每个构建目标调用一次 `pkg --sea` → 可执行文件 `dsh-jsonrpc-agent-pkg-<platform>-<arch>` 写入 `dist-exe/`，并拷回运行时目录。Linux 安装会从源码构建 `pty.node`，而 `--legacy` 部署会省略该副作用目录，因此构建器会把它从根安装目录复制到暂存闭包；macOS 使用对应目标的预构建产物，并在可执行文件旁生成所需的 `-spawn-helper`。CI 将这些产物作为测试中间输入，只保留对应平台的 wheel 包。四个部署标志都有实测依据：未启用 `inject-workspace-packages` 时必须使用 `--legacy`；`hoisted` 产出无符号链接的文件树（对 pkg VFS 最稳定，并从物理上保证只有一个 Cordis 实例）；关闭对等依赖自动安装可避免未发布包名触发注册表解析；`link-workspace-packages` 让闭包指向工作区/vendor 源码。
 
 CI 使用 [`.github/workflows/build-exe-for-python-sdk.yml`](../../../../.github/workflows/build-exe-for-python-sdk.yml)，且只允许显式触发：手动派发 `workflow_dispatch`，或给 PR 添加 `build-exe` 标签。linux-x64、linux-arm64（`ubuntu-24.04-arm`）和 macos-arm64 三个平台分别进行原生构建，并缓存 `~/.pkg-cache`；macOS 的 ad-hoc 签名由 pkg 处理。每个平台都使用模拟 SSE 模型，分别通过默认配置和自定义 `cordis.yml` 驱动 SDK，再通过 NDJSON JSON-RPC 直接驱动 exe，校验 JSONL 与最终响应；最后把发布形态的 wheel 包安装到干净的 venv 中，并在不传 `runtime_bin` 的情况下运行。Linux 还会检查 GLIBC 依赖，并在 manylinux 2.28 容器中运行。完整构建三个目标时保留 4 个产物，每个产物只含一个发布文件：平台无关的 SDK wheel 包与 3 个原生运行时 wheel 包；手动选择部分目标时保留 SDK wheel 与所选运行时 wheel。裸 exe 与源码包只作为测试中间输入。[`.gitlab-ci.yml`](../../../../.gitlab-ci.yml) 只接受版本与根目录 `package.json` 匹配的 `python-vX.Y.Z` 标签流水线，构建一个 SDK wheel 包和 3 个原生运行时 wheel 包，再由单个串行任务校验并将这 4 个文件发布到项目的 PyPI 注册表。Windows 不在目标范围内。
 
 ### Python SDK 分发：双载体，exe 用于生产，`node` 用于开发
 
-Python SDK 位于 [`python/`](../../../../python/README.md)：`python/sdk` 是客户端，`python/sdk-runtime` 是运行时载体包。运行时包的数据目录包含三类内容：检入的默认 `runtime/cordis.yml`、构建注入的平台 exe，以及构建注入的 `runtime/node/` 闭包树。`resolve_bundled_launch_args()` 的自动解析**只查找 exe**；`node` 载体仅在显式设置 `DSH_RUNTIME_MODE=node` 时启用（运行 `runtime/node/node_modules/@deepseek-ai/dsh-jsonrpc-demo/lib/bin.js`，需要系统 Node ≥22.19），定位为本仓库成员的开发验证通道，不随 wheel 包分发。
+Python SDK 位于 [`python/`](../../../../python/README.md)：`python/sdk` 是客户端，`python/sdk-runtime` 是运行时载体包。运行时包的数据目录包含检入的默认 `runtime/cordis.yml`、构建注入的平台 exe 与可选 helper，以及构建注入的 `runtime/node/` 闭包树。`resolve_bundled_launch_args()` 的自动解析**只查找 exe**；`node` 载体仅在显式设置 `DSH_RUNTIME_MODE=node` 时启用（运行 `runtime/node/node_modules/@deepseek-ai/dsh-jsonrpc-demo/lib/bin.js`，需要系统 Node ≥22.19），定位为本仓库成员的开发验证通道，不随 wheel 包分发。
 
-[`scripts/build-python-release.py`](../../../../scripts/build-python-release.py) 从仓库根目录的 `package.json` 读取权威的稳定版本 `X.Y.Z`，以该版本暂存两个包，并让 SDK 精确依赖 `deepseek-harness-runtime-bin==X.Y.Z`。可选的 `python-vX.Y.Z` 发布标签只是一项一致性断言，与仓库版本不同时会被拒绝；源码 `pyproject.toml` 中的开发占位版本从不决定发布版本。SDK 是 `py3-none-any` wheel 包；只提供 wheel 包的运行时包恰好包含一个 exe，标签为 `py3-none-manylinux_2_28_x86_64`、`py3-none-manylinux_2_28_aarch64` 或 `py3-none-macosx_11_0_arm64`。其 Hatch 钩子拒绝 sdist、通用标签、混合可执行载荷以及不支持的平台。
+[`scripts/build-python-release.py`](../../../../scripts/build-python-release.py) 从仓库根目录的 `package.json` 读取权威的稳定版本 `X.Y.Z`，以该版本暂存两个包，并让 SDK 精确依赖 `deepseek-harness-runtime-bin==X.Y.Z`。可选的 `python-vX.Y.Z` 发布标签只是一项一致性断言，与仓库版本不同时会被拒绝；源码 `pyproject.toml` 中的开发占位版本从不决定发布版本。SDK 是 `py3-none-any` wheel 包；每个只提供 wheel 包的运行时包都包含一个 exe，macOS wheel 包还包含与其架构匹配的 helper。运行时 wheel 包使用 `py3-none-manylinux_2_28_x86_64`、`py3-none-manylinux_2_28_aarch64` 或 `py3-none-macosx_11_0_arm64` 三种标签之一；Hatch 钩子拒绝 sdist、通用标签、混合平台载荷、helper 缺失或多余，以及不支持的平台。
 
 exe“必须显式配置”的硬语义不变；零配置体验由包装层恢复：调用方没有提供 `cordis`、没有显式指定运行时，且环境中没有 `DSH_CORDIS_CONFIG` 时，客户端将检入的默认 `cordis.yml`（`agent-core` + 预载的 `llm-deepseek` + JSONL 持久化 + `bash-local` + `dsh-jsonrpc` 对外服务条目，并通过 `!!js` 使用环境变量兜底）显式注入 `DSH_CORDIS_CONFIG`。
 
@@ -62,7 +62,7 @@ exe 内支持 `dsh-workflow-workerthread` 与 `dsh-code-runtime-worker`。两个
 
 ## 测试
 
-验证面分三层。机制层：`--sea` 链路的实测结论内嵌在“决策”各节（VFS 内 ESM 动态 `import()`、单一 Cordis 实例、明确报错的配置链路、`node:sqlite`、macOS ad-hoc 签名可运行）。SDK 层：完整的无密钥 pytest 套件以假运行时对端覆盖客户端协议、子进程清理、绝对 `cwd` 传递、双载体启动与载体解析；根 CI 在 Python 3.10 上运行全部用例。端到端层：每个平台构建都通过默认 SDK 路径、自定义配置和直接二进制协议，对模拟端点完成一个轮次，并校验最终文本与 JSONL。自定义配置还会通过打包进 VFS 的真实工作线程文件执行 `run_code` 和不启动 agent 的 `workflow`。同一构建任务还会经 Python SDK 运行一组检入的 exe 专用快照：无密钥脚本化模型挂载一个会注册工具的 Cordis 插件，从 `run_code` 调用该工具，运行一个由 spawn 提供方直接启动的 subagent（子 agent）和一个会通过 spawn 启动第二个子 agent 的工作流，随后卸载该插件。比较时会规范化 SDK 结果与通知流，以及父会话和两个子会话的 JSONL 日志。该 harness 与 ACP 的 `pnpm run test:snapshot` 保持独立，因为二者的协议和构建产物不同。随后把平台 wheel 包安装进干净的 venv，并在不传 `runtime_bin` 的情况下运行。
+验证面分三层。机制层：`--sea` 链路的实测结论内嵌在“决策”各节（VFS 内 ESM 动态 `import()`、单一 Cordis 实例、明确报错的配置链路、`node:sqlite`、macOS ad-hoc 签名可运行）。SDK 层：完整的无密钥 pytest 套件以假运行时对端覆盖客户端协议、子进程清理、绝对 `cwd` 传递、双载体启动与载体解析；根 CI 在 Python 3.10 上运行全部用例。端到端层：每个平台构建都通过默认 SDK 路径、自定义配置和直接二进制协议，对模拟端点完成一个轮次，并校验最终文本与 JSONL。自定义配置还会通过打包进 VFS 的真实工作线程文件执行 `run_code` 和不启动 agent 的 `workflow`。同一构建任务还会经 Python SDK 运行一组检入的 exe 专用快照：无密钥脚本化模型挂载一个会注册工具的 Cordis 插件，从 `run_code` 调用该工具，运行一个由 spawn 提供方直接启动的 subagent（子 agent）和一个会通过 spawn 启动第二个子 agent 的工作流，随后卸载该插件。该 fixture（测试前置数据）会显式禁用组合包中未使用的 Bash 和本地 skill（技能）发现，使其工具集不依赖仓库外部状态；比较时会规范化以下各处的不透明消息 ID：SDK 结果与通知流，以及父会话和两个子会话的 JSONL 日志。该 harness 与 ACP 的 `pnpm run test:snapshot` 保持独立，因为二者的协议和构建产物不同。随后把平台 wheel 包安装进干净的 venv，并在不传 `runtime_bin` 的情况下运行。
 
 手工驱动注意：`bin` 将 stdin EOF 视为“客户端已离开”并立即 dispose，短命管道会中止进行中的轮次——管道驱动必须保持 stdin 打开，直到轮次结束。
 

.agents/notes/implemented/architecture/2026-07-30-session-end-seed-log-boundary.i18n.yaml

@@ -0,0 +1,6 @@
+# Bilingual-pair consistency record (docs/i18n/README.md): the git blob hash of each
+# side as of the last confirmed-consistent state. Both languages carry equal authority;
+# after editing either side, bring the other along and re-record with:
+#   pnpm run verify-translation-pairing --write .agents/notes/implemented/architecture/2026-07-30-session-end-seed-log-boundary.md
+2026-07-30-session-end-seed-log-boundary.md: 837531ba0bd3ecf404eb47ee933438546c682a54
+2026-07-30-session-end-seed-log-boundary.zh.md: 33680c1845364de62e5b53ead13de418a389f908

.agents/notes/implemented/architecture/2026-07-30-session-end-seed-log-boundary.md

@@ -0,0 +1,55 @@
+# Agent Note: the end-seed log boundary
+
+Status: implemented
+
+English | [中文](2026-07-30-session-end-seed-log-boundary.zh.md)
+
+## Problem
+
+A plugin that owns a standalone open/close bracket in the session log cannot tell a dead marker from a live one. `compact/start` … `compact/end` is the shipped case: on picking up a log whose last compaction event is an unmatched `compact/start`, "the previous writer died mid-compaction" and "a compaction is running right now" are byte-identical stored history. The owner must either refuse to compact a log that is actually free (wedging the session) or proceed over one that is genuinely busy.
+
+Nothing in the log marked where inherited history ended. `session/created`, `session/disposed`, and `session/flush` are cordis runtime signals, not log events; `agent/session-start` is emit-only. `Session.firstLiveSeq` already held the answer exactly — the seq of this lifecycle's first own write — but only in memory, so a consumer reading stored bytes could not see it.
+
+Crash repair does not close the gap and must not: `interruptedTurnClosers` synthesizes turn, step, and tool boundaries because core owns that vocabulary, and `compact/*` belongs to the compaction seam. A core repair pass that closed plugin brackets would put every plugin's bracket semantics in core.
+
+## Decision
+
+`Session`'s constructor appends the log-only `session/end-seed` event immediately after a non-empty constructor seed, as the seeded session's first live write at the seq `firstLiveSeq` names. The event is the durable projection of that field: `firstLiveSeq` answers where this lifecycle's writes start for a consumer holding the object, while `session/end-seed` answers the same question for one holding only stored bytes. Its payload is empty — position and `time` carry the whole meaning — and it is not a `SurfaceEventType`, so it produces no message and cannot perturb derived history.
+
+A bracket owner reads it positionally: an unmatched opening marker before `session/end-seed` has a smaller seq, came from the constructor seed, and belongs to a lifecycle that has ended. Core writes the boundary and reads nothing from it; each bracket's vocabulary stays with its owning plugin, so no core predicate helper ships without a consumer to shape it.
+
+The constructor is the placement because it is the single waist every seeded session passes through. All six entry points reach it: `agents.resume()`, config-driven startup on a persisted id (`restoreOrCreateConfigured`), `sessions.fork()`, a subagent fork child, `coordinator.adopt()`'s live-prefix path, and a bare `sessions.create(id, {seed})`. A boundary written at persistence load would miss both fork paths — and a forked child inheriting a still-running parent's open `compact/start` is precisely the case that must be classifiable. A boundary written at loop start would miss `fork()` and `adopt()`, and would have to fire on `SessionStartSource: 'startup'`, which is what a fork child publishes, so that field would stop discriminating.
+
+Two guards keep the marker from becoming noise. An empty seed writes nothing because there is no seed to end. A seed already ending in one is not re-marked, which makes the write idempotent. Idempotence is load-bearing rather than tidiness — `agentFor()` resumes a cold session on first touch, so merely opening one in a client is a pickup, and without the guard browsing would grow a log by one event per visit.
+
+## Persistence needs no changes
+
+The constructor append happens before `enter()`, so the session has no store attachment: the marker never publishes on `session/event`, exactly like the seed events before it. It is instead part of the log `initFor` captures as the creation seed, and persists through the ordinary seed path — `onCreated`'s `createCore` + `appendCore`, or the ownerless-claim suffix write. A consumer that watches the firehose therefore never sees the boundary and must read it from the log.
+
+Consequences for the seam: `load()` stays a pure read, with no revision bump, no `commitRepair` on a balanced log, and no durable mark left by a rejected `append`. **Attaching is not a pure read**, though — a pickup now writes where nothing was written before, so a read-only or full disk fails at `session/created` rather than at the first real turn. That is the one cost this placement adds, and it is narrower than the load-path version's (which failed the load itself).
+
+A crash before the seed write reaches disk loses the boundary, and that costs nothing: the pending batch is written in order, so a lost boundary means every event after it is lost too. The next pickup reads the same bytes the previous one did, appends its own boundary, and classifies the bracket identically. In-process consumers should prefer `firstLiveSeq`, which is exact before any write.
+
+## Scope of the guarantee
+
+The predicate holds for a bracket *this* session inherited, not as a liveness signal about other writers. A concurrently live session may hold an open bracket over the same stored history while its own boundary sits elsewhere. A consumer that must tolerate concurrent writers needs a liveness signal beyond the log and cannot omit it on the strength of this event.
+
+## Alternatives considered
+
+**A boundary written by the persistence coordinator's cold-load path.** Built first, as the [`session/resumed` boundary](../../rejected/architecture/2026-07-29-session-resumed-log-boundary.md), and abandoned before merge. It covers no fork, which is the one case where the inherited bracket's owner may still be running. Because the marker was minted at load it also had to be a durable write on a read path, which spread cost across the seam: a revision bump on every cold load, a `commitRepair` batch on a balanced log with nothing to repair, a stored-time floor to keep the clamp monotonic, and a load that failed against a read-only store.
+
+**A boundary appended at loop start.** The loop calls `resumeWith`, so it covers the resume paths, but it misses `fork()` and `adopt()` entirely, and the event would have to fire on `'startup'` — the source a fork child publishes — so `SessionStartSource` would stop discriminating. It also publishes the session before the marker is appended, so a `session/created` listener could observe a seeded log with no boundary.
+
+**Reusing `header.seedLength`.** It is the durable *fork-lineage* boundary and deliberately keeps the original fork value across a resume, where the constructor seed is the whole stored log. The two facts differ and conflating them would lose both.
+
+**Crash repair closing `compact/*` alongside turn boundaries.** Rejected: it moves every plugin's bracket semantics into core's repair pass, and core cannot know what closing another package's bracket should record.
+
+## Consequences
+
+Bought: one boundary, written in one place, correct for all six seeded-start paths — including the fork gap the persistence-layer version could not reach. The persistence packages keep a pure read path. `firstLiveSeq` gains a durable twin rather than a second, competing notion of the same boundary.
+
+Cost: a seeded session's log is one event longer, which moved seq expectations in tests across nine packages (session, agent-loop, persistence contract, jsonl, session-query, session-title, subagent-inprocess, telemetry, token-meter). Two of those updates are load-bearing rather than mechanical: telemetry's adoption tests now assert the boundary IS exported, because it is this lifecycle's own write, and the property suite's replay invariant is restated as "seed reproduced verbatim, plus one log-only boundary" with idempotence added as its own property.
+
+`session/end-seed` joins the on-disk vocabulary. Under the pre-release stance (`SESSION_FORMAT_VERSION` pinned at `0`, no compatibility promise) older logs simply lack it, and a log without a boundary correctly classifies nothing as constructor-seed history.
+
+Not built here: no plugin reads the boundary yet. Wiring the compaction seam's staleness check to it is the follow-up that motivated this boundary; the predicate helper belongs with that seam, where a real consumer decides its shape, rather than shipping into core untested against one.

.agents/notes/implemented/architecture/2026-07-30-session-end-seed-log-boundary.zh.md

@@ -0,0 +1,55 @@
+# Agent Note: 种子结束日志边界
+
+Status: implemented
+
+[English](2026-07-30-session-end-seed-log-boundary.md) | 中文
+
+## Problem
+
+拥有独立开／闭括号的插件无法区分一个已死的标记和一个存活的标记。`compact/start` … `compact/end` 就是已发布的实例：当接手一份日志、而它最后的压缩事件是一个未配对的 `compact/start` 时，"上一个写入方在压缩中途死掉了"与"此刻正有一次压缩在运行"在存储历史中是逐字节相同的。所有方只能二选一：拒绝压缩一份其实空闲的日志（把会话卡死），或者在一份确实繁忙的日志上继续压缩。
+
+日志中没有任何东西标出继承历史在哪里结束。`session/created`、`session/disposed` 与 `session/flush` 是 cordis 运行时信号，不是日志事件；`agent/session-start` 只发射不落盘。`Session.firstLiveSeq` 本来就精确地持有这个答案——本生命周期第一次自有写入的 seq——但只存在于内存中，因此读取存储字节的消费方看不到它。
+
+崩溃修复既没有填上这个缺口，也不应该去填：`interruptedTurnClosers` 合成轮次、步骤与工具边界，是因为核心拥有那套词汇表，而 `compact/*` 属于压缩 seam。一个会关闭插件括号的核心修复流程，等于把每个插件的括号语义都搬进核心。
+
+## Decision
+
+`Session` 的构造函数紧接非空构造种子之后追加仅日志事件 `session/end-seed`，作为带种子会话的第一次实时写入，位置正是 `firstLiveSeq` 指出的 seq。该事件是那个字段的持久投影：`firstLiveSeq` 为持有对象的消费方回答本生命周期的写入从哪里开始，`session/end-seed` 则为只持有存储字节的消费方回答同一问题。它的 payload 为空——位置与 `time` 承载全部含义——并且不是 `SurfaceEventType`，因此不产生消息，也无法扰动派生历史。
+
+括号所有方按位置读取它：在 `session/end-seed` 之前的未配对开启标记具有更小的 seq，来自构造种子，并且属于一个已结束的生命周期。核心写入该边界但不从中读取任何内容；每个括号的词汇表仍归其所属插件，因此在没有消费方来塑形之前，核心不会先发布谓词辅助函数。
+
+选择构造函数，是因为它是每一个带种子会话都必经的唯一收窄处。全部六个入口都会到达它：`agents.resume()`、在已持久化 id 上的配置驱动启动（`restoreOrCreateConfigured`）、`sessions.fork()`、子代理 fork 子会话、`coordinator.adopt()` 的实时前缀路径，以及裸的 `sessions.create(id, {seed})`。在持久化加载时写入的边界会漏掉两条 fork 路径——而一个继承了仍在运行的父会话开放 `compact/start` 的 fork 子会话，恰恰是必须可判定的场景。在 loop 启动时写入的边界会漏掉 `fork()` 与 `adopt()`，并且不得不在 `SessionStartSource: 'startup'` 上触发——那正是 fork 子会话发布的取值，于是该字段将不再具有区分力。
+
+两条守卫让这个标记不至于变成噪声。空种子不写入任何内容，因为没有种子需要结束。种子本身已以该事件结尾时不会重复标记，这让写入具备幂等性。幂等性是承重的，而不是为了整洁——`agentFor()` 会在首次触碰时恢复一个冷会话，因此在客户端里仅仅打开一个会话就是一次接手；没有这条守卫，浏览会让日志每访问一次就增长一个事件。
+
+## 持久化无需任何改动
+
+构造函数中的 append 发生在 `enter()` 之前，因此会话尚无 store attachment：该标记不会在 `session/event` 上发布，与它之前的种子事件完全一样。它属于 `initFor` 捕获的那份创建种子，并通过普通的种子路径落盘——`onCreated` 的 `createCore` + `appendCore`，或无主认领的后缀写入。因此监听 firehose 的消费方永远看不到这条边界，必须从日志中读取它。
+
+对 seam 的影响：`load()` 仍是纯读取，没有 revision 递增，对平衡日志不走 `commitRepair`，被拒绝的 `append` 也不留下持久标记。但**接手不是纯读取**——如今一次拾起会在此前完全无写入的路径上产生写入，因此只读存储或磁盘写满会在 `session/created` 处报错，而不是在第一个真实轮次处。这是本放置方式新增的唯一成本，并且比加载路径方案的成本更窄（后者会让加载本身失败）。
+
+若崩溃发生在种子写入到达磁盘之前，边界会丢失，而这没有代价：待处理批次按序写入，所以丢掉一个边界意味着它之后的每个事件也一起丢掉。下一次接手读到的字节与上一次相同，会追加自己的边界，并对括号作出完全相同的判定。进程内消费方应优先使用 `firstLiveSeq`，它在任何写入之前就是精确的。
+
+## 保证的适用范围
+
+该谓词对*本*会话继承的括号成立，而不是关于其他写入方的存活信号。一个并发存活的会话可能在同一段存储历史上持有开放括号，而它自己的边界在别处。必须容忍并发写入方的消费方需要日志之外的存活信号，不能仅凭这个事件就省掉它。
+
+## Alternatives considered
+
+**由持久化协调器的冷加载路径写入边界。** 最先实现的方案，即 [`session/resumed` 边界](../../rejected/architecture/2026-07-29-session-resumed-log-boundary.md)，在合并前被放弃。它完全覆盖不到 fork，而 fork 恰恰是继承括号的所有方可能仍然存活的那一种情形。由于标记是在加载时铸造的，它还必须在读取路径上做持久写入，这把成本铺开到整个 seam：每次冷加载都递增 revision、对一份无需修复的平衡日志也要走 `commitRepair`、需要一个已存储时间下限来维持钳制的单调性，以及加载在只读存储上会失败。
+
+**在 loop 启动时追加边界。** loop 调用 `resumeWith`，因此覆盖恢复路径，但完全漏掉 `fork()` 与 `adopt()`，而且事件不得不在 `'startup'` 上触发——那是 fork 子会话发布的来源——于是 `SessionStartSource` 将不再具有区分力。它还会在追加标记之前就发布会话，因此 `session/created` 监听方可能观察到一份没有边界的带种子日志。
+
+**复用 `header.seedLength`。** 它是持久的 *fork 血缘*边界，并且刻意在恢复时保留原始 fork 取值——而恢复时构造种子是整份存储日志。这两个事实并不相同，混同会同时失去两者。
+
+**让崩溃修复连同轮次边界一起关闭 `compact/*`。** 否决：这会把每个插件的括号语义搬进核心的修复流程，而核心无法知道关闭另一个包的括号应该记录什么。
+
+## Consequences
+
+买到的：一条边界，在一处写入，对全部六条带种子启动路径都正确——包括持久化层方案触及不到的 fork 缺口。持久化各包保留纯读取路径。`firstLiveSeq` 获得一个持久孪生体，而不是关于同一边界的第二套彼此竞争的概念。
+
+代价：带种子会话的日志长了一个事件，这在九个包（session、agent-loop、持久化契约、jsonl、session-query、session-title、subagent-inprocess、telemetry、token-meter）里挪动了 seq 期望。其中两处更新是承重的而非机械的：telemetry 的收养测试现在断言该边界*会*被导出，因为它是本生命周期的自有写入；而属性测试套件的重放不变式被重述为"种子逐字节复现，外加一个仅日志边界"，并把幂等性补成一条独立属性。
+
+`session/end-seed` 加入了落盘词汇表。在预发布立场下（`SESSION_FORMAT_VERSION` 固定为 `0`，不作兼容承诺），更旧的日志只是没有它，而没有边界的日志会正确地判定没有任何内容属于构造种子历史。
+
+此处未做：还没有任何插件读取该边界。把压缩 seam 的陈旧性检查接到它上面，是催生这条边界的后续工作；谓词辅助函数应当归属那个 seam——在那里由真实消费方决定它的形状——而不是未经真实消费方检验就先落进核心。

.agents/notes/implemented/feature/2026-07-29-persistent-bash-str-replace-editor.i18n.yaml

@@ -0,0 +1,6 @@
+# Bilingual-pair consistency record (docs/i18n/README.md): the git blob hash of each
+# side as of the last confirmed-consistent state. Both languages carry equal authority;
+# after editing either side, bring the other along and re-record with:
+#   pnpm run verify-translation-pairing --write .agents/notes/implemented/feature/2026-07-29-persistent-bash-str-replace-editor.md
+2026-07-29-persistent-bash-str-replace-editor.md: a97af750bdd80ddf38dc2d126e70c245ed035f35
+2026-07-29-persistent-bash-str-replace-editor.zh.md: 0c2ab26693d90c91d5c41a128ebb77a3c6cc2e7f

.agents/notes/implemented/feature/2026-07-29-persistent-bash-str-replace-editor.md

@@ -0,0 +1,33 @@
+# Agent Note: Persistent Bash and string-replacement editor tools
+
+Status: implemented
+
+English | [中文](2026-07-29-persistent-bash-str-replace-editor.zh.md)
+
+## Problem
+
+Some deployments need a one-call Bash schema whose shell state survives across model turns, while others need a Claude-style `str_replace_editor` independent of their terminal choice. Bundling the two tools or naming them after one benchmark would prevent reuse and blur configuration ownership.
+
+## Decision
+
+`@deepseek-ai/dsh-tool-bash-persistent` consumes `ctx.pty` and registers one `bash(command)` tool. It lazily creates one interactive shell per exact Agent and serializes that owner's calls. Cwd, exported variables, activated environments, functions, and background jobs persist. Random private markers delimit command output. Retained scrollback is paged backward to recover the command's original prefix; a dropped prefix is reported explicitly. A nonzero wrapped command appends `[exit code: N]`; a shell that dies before reporting that status instead appends `[shell exited: code N]`, `[shell killed by signal: SIG]`, or `[shell exited]` when the backend supplies neither. `maxOutputChars` bounds retained command output, while fixed diagnostics can extend the returned string. Timeout or cancellation closes the shell before another call can reuse uncertain state, and model-visible timeout/exit results disclose that reset. Cancellation always resets and discards the result, even when a complete status marker is already observable, so state changes the model never saw cannot survive. The configurable description defaults to persistence facts only, so network and package-mirror claims remain deployment-owned.
+
+`@deepseek-ai/dsh-tool-str-replace-editor` independently consumes `ctx.fs` and registers `str_replace_editor` with `view`, `create`, `str_replace`, and `insert`. It provides numbered text views, filtered two-level directory listings, unique literal replacement, canonical insertion boundaries, and bounded output. Paths are absolute; file views preserve content tabs so copied text remains valid literal replacement input; mutations preserve tabs outside the requested edit; and the public schema and failures use only `old_str`. The plugin can compose with persistent Bash, one-shot Bash, sandboxed Bash, or no shell.
+
+`dsh-system-prompt` accepts `includeHarnessIdentity: false`, while `dsh-agent-spine-demo` forwards that setting and accepts `toolBash: false`. A deployment can therefore own an exact persona and replace the spine's native Bash without duplicate prompt or tool registrations. Existing defaults remain unchanged.
+
+Both plugins are included in the Python runtime closure. The persistent Bash closure also includes the PTY service/local backend and the sandbox services required by that backend. Because `node-pty` executes a native `spawn-helper` on macOS, each packaged macOS runtime executable ships with a `-spawn-helper` sibling; Linux uses `forkpty` directly. A pinned `node-pty` patch checks `DSH_NODE_PTY_SPAWN_HELPER` first, so it remains a true override for a current external consumer that supplies a non-sibling helper. When the override is unset, the patch resolves the packaged executable sibling if present and otherwise preserves upstream lookup in ordinary Node runs. The macOS builders fail before publication when the helper is absent or not executable.
+
+## Alternatives considered
+
+**One combined compatibility plugin.** Rejected because neither tool requires the other and the combined name would tie reusable capabilities to one benchmark.
+
+**Reuse one-shot Bash.** Rejected because `bash -c` cannot preserve cwd or environment state across calls.
+
+**Expose terminal management tools.** Rejected because open/send/read/close is a different model action space from one persistent `bash` call.
+
+**Modify native read/write/edit.** Rejected because it would distort their general-purpose contracts instead of adding an independently composable editor.
+
+## Consequences
+
+Profiles can reproduce an external agent by configuring persona and descriptions while the underlying packages remain general. Persistent Bash requires an owning Agent and real PTY backend. Shell exit, timeout, or cancellation loses state. The editor delegates security and mutation policy to the mounted filesystem stack. Runtime-wheel consumers still need no Node installation; Linux wheels contain one executable, while macOS wheels also contain its private native helper.

.agents/notes/implemented/feature/2026-07-29-persistent-bash-str-replace-editor.zh.md

@@ -0,0 +1,33 @@
+# Agent Note：持久 Bash 与字符串替换编辑器工具
+
+状态：已实现
+
+[English](2026-07-29-persistent-bash-str-replace-editor.md) | 中文
+
+## 问题
+
+部分部署需要只调用一次的 Bash schema，同时要求 shell 状态跨模型轮次保留；另一些部署需要与终端选择无关的 Claude 风格 `str_replace_editor`。把两个工具绑在一起或按某个基准命名，会阻碍复用并模糊配置归属。
+
+## 决策
+
+`@deepseek-ai/dsh-tool-bash-persistent` 消费 `ctx.pty` 并注册一个 `bash(command)` 工具。它为每个精确 Agent 惰性创建一个交互式 shell，并串行化该所有者的调用。Cwd、导出的变量、已激活环境、函数和后台任务会保留。随机私有标记划分命令输出；保留的 scrollback 会向前分页，以恢复命令真正的输出前缀，若前缀已被丢弃则明确告知。经封装的命令以非零状态结束时，会追加 `[exit code: N]`；若 shell 在报告该状态前终止，则改为追加 `[shell exited: code N]`、`[shell killed by signal: SIG]`，或在后端既未提供退出码也未提供信号时追加 `[shell exited]`。`maxOutputChars` 限制保留的命令输出，而固定诊断可能使返回字符串更长。超时或取消会先关闭 shell，避免下一次调用复用状态不确定的会话，模型可见的超时／退出结果也会说明该重置。取消始终会重置 shell 并丢弃结果，即使已经能观察到完整状态标记也是如此，从而不会让模型未曾看到的状态变更得以保留。可配置描述默认只声明持久性事实，因此网络和软件包镜像等声明仍归部署所有。
+
+`@deepseek-ai/dsh-tool-str-replace-editor` 独立消费 `ctx.fs`，注册包含 `view`、`create`、`str_replace` 与 `insert` 的 `str_replace_editor`。它提供带行号文本查看、过滤后的两层目录列表、唯一字面量替换、规范插入边界和有界输出。路径必须为绝对路径；文件查看会保留内容中的制表符，因此复制的文本仍可作为有效的字面量替换输入；变更会保留请求编辑范围之外的制表符；公开 schema 与错误则只使用 `old_str`。它可以与持久 Bash、一次性 Bash、沙箱 Bash 或无 shell 组合。
+
+`dsh-system-prompt` 接受 `includeHarnessIdentity: false`；`dsh-agent-spine-demo` 会转发该设置，并接受 `toolBash: false`。因此部署可以拥有精确 persona，并替换 spine 的原生 Bash，而不会重复注册提示词或工具。既有默认值不变。
+
+两个插件都进入 Python runtime 闭包。持久 Bash 的闭包还包含 PTY 服务／本地后端，以及该后端要求的沙箱服务。由于 `node-pty` 在 macOS 上会执行原生 `spawn-helper`，每个打包后的 macOS 运行时可执行文件都会携带一个 `-spawn-helper` 伴随文件；Linux 直接使用 `forkpty`。固定版本的 `node-pty` 补丁会先检查 `DSH_NODE_PTY_SPAWN_HELPER`，因此对当前提供非伴随 helper 的外部消费方而言，该变量仍是真正的覆盖项。未设置该覆盖时，补丁会在打包可执行文件的伴随文件存在时解析它，否则在普通 Node 运行中保留上游查找方式。若 helper 缺失或不可执行，macOS 构建器会在发布前失败。
+
+## 考虑过的替代方案
+
+**单一组合兼容插件。** 被拒绝，因为两个工具互不依赖，组合命名还会把可复用能力绑定到某个基准。
+
+**复用一次性 Bash。** 被拒绝，因为 `bash -c` 无法跨调用保留 cwd 或环境状态。
+
+**暴露终端管理工具。** 被拒绝，因为 open/send/read/close 与单个持久 `bash` 调用是不同的模型动作空间。
+
+**修改原生 read/write/edit。** 被拒绝，因为这会扭曲其通用契约，而不是增加一个可独立组合的编辑器。
+
+## 后果
+
+Profile 可以通过配置 persona 和描述复现外部 Agent，而底层包保持通用。持久 Bash 需要拥有它的 Agent 与真实 PTY 后端；shell 退出、超时或取消会丢失状态。编辑器把安全与变更策略委托给挂载的文件系统栈。运行时 wheel 包的消费方仍无需安装 Node；Linux wheel 包包含一个可执行文件，macOS wheel 包还包含其私有原生 helper。

.agents/notes/proposed/architecture/2026-07-29-durable-last-activity-index.i18n.yaml

@@ -0,0 +1,6 @@
+# Bilingual-pair consistency record (docs/i18n/README.md): the git blob hash of each
+# side as of the last confirmed-consistent state. Both languages carry equal authority;
+# after editing either side, bring the other along and re-record with:
+#   pnpm run verify-translation-pairing --write .agents/notes/proposed/architecture/2026-07-29-durable-last-activity-index.md
+2026-07-29-durable-last-activity-index.md: 0938e7ea2aa817818ed552fd8b702795840b547a
+2026-07-29-durable-last-activity-index.zh.md: 647bce817444c77ac3cd6f51385472fff745212f

.agents/notes/proposed/architecture/2026-07-29-durable-last-activity-index.md

@@ -0,0 +1,66 @@
+# Agent Note: Record last activity in the session index
+
+Status: proposed
+
+English | [中文](2026-07-29-durable-last-activity-index.zh.md)
+
+## Problem
+
+A cold (persisted, unattached) session has no stored answer to "when was this last worked in". `dsh-host-apiproxy`'s `summarizeCold()` therefore approximates it with the log file's mtime where one exists — `locate()` resolves a per-session artifact for JSONL and `undefined` for SQLite, whose cold sessions fall back to `createdAt` — and the web client sorts its session tree by the resulting `updatedAt`. The two backends are wrong in opposite directions: JSONL reads too new, SQLite too old.
+
+mtime answers a different question: when the artifact was last written. Every durable write refreshes it, including writes that are not activity — a truncate-repair of a torn tail, the synthetic closers that balance an interrupted turn, and the [`session/end-seed` boundary](../../implemented/architecture/2026-07-30-session-end-seed-log-boundary.md) a seeded session appends. (A `flush` with nothing pending is not among them: the coordinator returns without reaching the backend.) The visible consequence is stable and wrong in one direction: a session touched without being worked in promotes itself above sessions the user actually worked in afterwards, and each touch re-promotes it. "Touched" is broader than "resumed" — `dsh-host-apiproxy`'s `agentFor()` resumes a cold session on first touch, and `sessions.history` reaches it when the web client merely opens one, so ordinary browsing is enough.
+
+The attached projection has a real fix — `lastActivityTime()` skips boundaries — but it needs the event log, and the cold path deliberately does not read one. Reading the log to compute `updatedAt` would defeat the header-only listing that keeps `list()` scaling with session count rather than log size.
+
+The [boundary change](../../implemented/architecture/2026-07-30-session-end-seed-log-boundary.md) raised the frequency of this defect, because a pickup now writes where nothing was written before; `dsh-host-apiproxy`'s README records it under Known Limitations. It did not introduce the approximation, and removing the approximation is a durable-format decision, which is why it is scoped here rather than there.
+
+## Proposal
+
+Store last-activity time where a listing already reads — the session index — so `summarizeCold()` can serve it without opening the log. The coordinator computes the value, because it sees every append and already owns per-id state; backends persist it. That makes it a new `PersistenceBackend` contract element rather than backend-local bookkeeping, and keeps one definition of "activity" shared with the in-log `lastActivityTime()`.
+
+The two shipped backends have opposite constraints, and the proposal is deliberately asymmetric about them:
+
+- **SQLite** gets a column on `sessions`, written in the same transaction as `appendBatch`, at the cost of a monotonic `SCHEMA_VERSION` bump.
+- **JSONL cannot host a mutable header field.** The header is line 1, written once during materialization, and the log is opened for append forever after; `jsonl.spec.ts` pins that committed bytes are never rewritten. A per-append header field would violate an asserted durability invariant, not merely complicate the writer. A per-session sidecar file is the shape to compare against leaving JSONL approximate.
+
+Three questions must be answered before implementation, and none of them is settled here:
+
+**Which events count as activity?** `lastActivityTime()` answers this for the log by excluding `session/end-seed`. A stored field encodes the rule at write time, where the writer sees one batch rather than the whole log. The two must not drift, or the attached and cold surfaces will disagree about the same session.
+
+**How do pre-field logs behave?** Existing artifacts have no value. Falling back to mtime keeps them at today's accuracy; falling back to `createdAt` is honest but reorders every existing session in the picker and the tree.
+
+**Is a sidecar acceptable for JSONL?** It reintroduces a second file per session that can disagree with the log, which the single-artifact design avoided.
+
+## Alternatives considered
+
+**Read the log on the cold path.** Correct by construction and needs no format change, but it defeats the header-only listing: `list()` would scale with total log size, and the web session tree fans out over every session in the store. This is the option the mtime approximation exists to avoid.
+
+**Keep mtime and exclude boundary writes from it.** Rejected as impossible rather than undesirable: mtime is the filesystem's, not the backend's. Nothing short of restoring the timestamp after every boundary write would preserve it, and that races any concurrent reader and lies about the artifact.
+
+**Write the boundary only when repair occurred.** Would reduce the frequency, and the [boundary note](../../implemented/architecture/2026-07-30-session-end-seed-log-boundary.md) already rejected it: the predicate must hold for an orderly restart too. Trading a correctness invariant for timestamp accuracy is the wrong direction.
+
+**Derive activity from a projection cache.** `session-projection-cache` already folds tails past a watermark, so a last-activity unit would ride existing machinery. Rejected as the primary shape because the cache is an optional composition entry; a listing served only when a cache plugin is mounted makes ordering depend on composition.
+
+## Acceptance criteria
+
+- `SessionSummary.updatedAt` for a cold session equals the same value the attached projection reports for that session, verified by resuming, quitting without a turn, and asserting the order is unchanged across both paths.
+- A resumed-then-abandoned session does not sort above a session worked in afterwards, in the web session tree and the TUI resume picker, pinned by an assembled snapshot rather than unit tests alone.
+- The activity rule has one definition: a test proves the stored field and `lastActivityTime()` agree over a log containing boundaries, closers, and a plain turn.
+- Pre-field artifacts load and list without error under the chosen fallback, with the fallback's ordering consequence asserted.
+- SQLite's `SCHEMA_VERSION` bump rejects the old on-disk version per the repo's no-migration stance.
+
+## Risks
+
+**Two definitions of activity drift.** The stored field is computed per batch, the projection over a whole log. A new event type classified one way at write time and the other at read time yields a session whose cold and attached orderings disagree — a bug that only appears after a restart, which is where it is hardest to notice.
+
+**A JSONL sidecar can disagree with its log.** A crash between the log append and the sidecar write leaves a stale value with no torn-tail marker to repair it. Every consumer would need to treat the sidecar as a hint, which is close to what mtime already is.
+
+**The fallback reorders existing sessions.** Whichever fallback is chosen, users with existing logs see their picker and tree reorder once on upgrade. `createdAt` makes that reordering large.
+
+**Cost may exceed the defect.** The defect is a misordering of abandoned sessions. If the honest answer for JSONL is "keep the approximation", this note's outcome may be documenting that decision rather than implementing a field — and that is an acceptable outcome.
+
+## Related
+
+- [The end-seed log boundary](../../implemented/architecture/2026-07-30-session-end-seed-log-boundary.md) — one of the non-activity writes mtime counts; `dsh-session` owns `lastActivityTime()`, the in-log projection a stored field must agree with.
+- [Session persistence](../../implemented/architecture/2026-06-14-session-persistence.md) — the append-only and never-rewrite invariants that rule out a mutable JSONL header field.
+- [Shared persistence write coordinator](../../implemented/architecture/2026-06-18-shared-persistence-write-coordinator.md) — the append path a stored field would hook into.

.agents/notes/proposed/architecture/2026-07-29-durable-last-activity-index.zh.md

@@ -0,0 +1,66 @@
+# Agent Note: 在会话索引中记录最后活动
+
+Status: proposed
+
+[English](2026-07-29-durable-last-activity-index.md) | 中文
+
+## 问题
+
+一个冷会话（已持久化、未附加）对「上次是什么时候在这里面工作过」没有任何已存储的答案。因此 `dsh-host-apiproxy` 的 `summarizeCold()` 在存在日志文件时用它的 mtime 来近似它——`locate()` 为 JSONL 解析出一个逐会话产物，为 SQLite 解析出 `undefined`，而 SQLite 的冷会话会回退到 `createdAt`——而 web 客户端就按由此得到的 `updatedAt` 为自己的会话树排序。这两个后端错的方向正好相反：JSONL 读出来偏新，SQLite 偏旧。
+
+mtime 回答的是另一个问题：这份产物上次是什么时候被写入的。每一次持久写入都会刷新它，包括那些并不是活动的写入：一次对撕裂尾部的截断修复、用来平衡被中断的轮次的那些合成 closer，以及带种子的会话会追加的 [`session/end-seed` 边界](../../implemented/architecture/2026-07-30-session-end-seed-log-boundary.md)。（没有待处理内容的 `flush` 不在其中：协调器在到达后端之前就返回了。）用户可见的后果是稳定的，而且只朝一个方向错：一个被触碰过却没有在里面工作过的会话，会把自己排到用户此后真正工作过的那些会话之前，而且每次触碰都会重新把它排上去一次。「触碰」比「恢复」的范围更宽——`dsh-host-apiproxy` 的 `agentFor()` 会在首次触碰时恢复一个冷会话，而 web 客户端仅仅打开一个会话时 `sessions.history` 就会到达它，因此普通的浏览就够了。
+
+已附加会话的那个投影有真正的修复办法（`lastActivityTime()` 会跳过边界），但它需要事件日志，而冷路径有意不去读日志。为计算 `updatedAt` 而读取日志，会让只读 header 的列举失去意义，而正是它让 `list()` 的开销随会话数量而非日志体量增长。
+
+[边界那次变更](../../implemented/architecture/2026-07-30-session-end-seed-log-boundary.md)提高了这个缺陷的出现频率，因为一次拾起如今会在此前完全无写入的路径上产生写入；`dsh-host-apiproxy` 的 README 已在 Known Limitations 中记录该项。它并没有引入这套近似做法，而移除这套近似是一项持久格式决策，因此它的范围划在本文，而不是那里。
+
+## 提案
+
+把最后活动时间存到列举本就会读取的地方，也就是会话索引，这样 `summarizeCold()` 无需打开日志就能给出答案。该值由协调器计算，因为它看得到每一次追加，而且本就拥有每 id 状态；由后端负责持久化。这样它就成为 `PersistenceBackend` 契约中新增的一个要素，而不是各后端本地的账目，同时让「活动」只保留一个定义，与日志内的 `lastActivityTime()` 共用。
+
+两个已交付的后端受到的约束正好相反，本提案对它们有意采取不对称的处理：
+
+- **SQLite** 在 `sessions` 表上得到一列，与 `appendBatch` 在同一个事务中写入，代价是一次单调的 `SCHEMA_VERSION` 递增。
+- **JSONL 无法承载一个可变的 header 字段。** header 就是第 1 行，在物化时一次写就，此后这份日志永远以追加方式打开；`jsonl.spec.ts` 钉住了「已提交的字节绝不重写」。一个每次追加都要改的 header 字段，违反的是一条被断言的持久性不变式，而不只是让写入方变复杂。要与「让 JSONL 保持近似」相比较的形态，是每会话一个伴随文件。
+
+实现之前必须回答三个问题，本文对它们都没有定论：
+
+**哪些事件算作活动？** 对日志而言，`lastActivityTime()` 通过排除 `session/end-seed` 回答了这个问题。一个已存储字段是在写入时编码这条规则的，而写入方在那里只看到一个批次，不是整份日志。两者不得发生漂移，否则已附加表层与冷表层会对同一个会话给出彼此矛盾的答案。
+
+**该字段引入之前的日志表现如何？** 既有产物里没有这个值。回退到 mtime 能让它们保持今天的准确度；回退到 `createdAt` 是诚实的，但会把选择器和会话树里每一个既有会话都重新排一次序。
+
+**对 JSONL 来说伴随文件可以接受吗？** 它重新引入了每会话第二个文件，而该文件可能与日志不一致，这正是单产物设计所避开的。
+
+## 考虑过的替代方案
+
+**在冷路径上读取日志。** 它按构造就是正确的，也不需要改动格式，但会让只读 header 的列举失去意义：`list()` 的开销将随日志总体量增长，而 web 会话树会扇出到存储中的每一个会话。mtime 近似的存在，正是为了避开这个选项。
+
+**保留 mtime，但把边界的写入排除在它之外。** 否决的理由是做不到，而不是不合意：mtime 属于文件系统，不属于后端。除了在每次边界写入之后把时间戳复原，没有别的办法能保住它，而那样做会与任何并发读取方产生竞态，也会对这份产物撒谎。
+
+**仅在确实发生了修复时才写入边界。** 这能降低出现频率，而[边界 Agent Note](../../implemented/architecture/2026-07-30-session-end-seed-log-boundary.md)已经否决过它：谓词对有序重启同样必须成立。用一条正确性不变式去换时间戳的准确度，方向是错的。
+
+**从投影缓存派生活动时间。** `session-projection-cache` 本就会折叠水位线之后的尾部，因此一个最后活动单元可以搭乘既有机制。它作为主形态被否决，因为该缓存是一个可选的组合项；只有挂载了缓存插件才提供的列举，会让排序取决于如何组合。
+
+## 验收标准
+
+- 冷会话的 `SessionSummary.updatedAt` 等于已附加会话的投影为同一个会话报告的那个值；验证方式是恢复、不跑轮次就退出，并断言两条路径上的顺序都没有变化。
+- 在 web 会话树和 TUI 恢复选择器中，一个恢复后即被弃置的会话不会排到此后工作过的会话之前；由一份组装后的快照钉住，而不是只靠单元测试。
+- 活动规则只有一个定义：一个测试证明，在一份同时包含边界、closer 和一个普通轮次的日志上，已存储字段与 `lastActivityTime()` 的结果一致。
+- 在选定的回退方案下，该字段引入之前的产物能够无错误地加载和列举，并且该回退在排序上的后果有断言覆盖。
+- 按本仓库不做迁移的立场，SQLite 的 `SCHEMA_VERSION` 递增会拒绝旧的磁盘版本。
+
+## 风险
+
+**「活动」的两个定义发生漂移。** 已存储字段按批次计算，而投影在整份日志上计算。一种新事件类型若在写入时按一种方式归类、在读取时按另一种方式归类，就会产生一个冷排序与已附加排序彼此矛盾的会话；这个缺陷只在重启之后才显现，而那正是最难被注意到的地方。
+
+**JSONL 的伴随文件可能与它的日志不一致。** 在日志追加与伴随文件写入之间发生崩溃，会留下一个陈旧的值，而且没有撕裂尾部标记可用来修复它。每个消费方都得把伴随文件当作一条提示来对待，而这与 mtime 今天的地位已经很接近了。
+
+**回退方案会让既有会话重新排序。** 无论选定哪种回退，持有既有日志的用户都会在升级时看到自己的选择器和会话树重新排一次序。选 `createdAt` 会让这次重排的幅度很大。
+
+**代价可能超过这个缺陷本身。** 该缺陷是被弃置会话的排序出错。如果对 JSONL 来说诚实的答案是「保留这套近似」，那么本文的结局可能是记录下这个决定，而不是实现一个字段，而这也是一个可以接受的结局。
+
+## 相关
+
+- [种子结束日志边界](../../implemented/architecture/2026-07-30-session-end-seed-log-boundary.md)——mtime 会计入的非活动写入之一；`dsh-session` 拥有 `lastActivityTime()`，也就是一个已存储字段必须与之保持一致的那个日志内投影。
+- [会话持久化](../../implemented/architecture/2026-06-14-session-persistence.md)——仅追加与绝不重写这两条不变式，正是它们排除了可变的 JSONL header 字段。
+- [共享持久化写入协调器](../../implemented/architecture/2026-06-18-shared-persistence-write-coordinator.md)——一个已存储字段将挂入的那条追加路径。

.agents/notes/rejected/architecture/2026-07-29-session-resumed-log-boundary.i18n.yaml

@@ -0,0 +1,6 @@
+# Bilingual-pair consistency record (docs/i18n/README.md): the git blob hash of each
+# side as of the last confirmed-consistent state. Both languages carry equal authority;
+# after editing either side, bring the other along and re-record with:
+#   pnpm run verify-translation-pairing --write .agents/notes/rejected/architecture/2026-07-29-session-resumed-log-boundary.md
+2026-07-29-session-resumed-log-boundary.md: 877b0c780f4c92983d2762243fac4e26d945887a
+2026-07-29-session-resumed-log-boundary.zh.md: a6f6ecc0d3f3a349f1a438eec0a84f27f8f649b2

.agents/notes/rejected/architecture/2026-07-29-session-resumed-log-boundary.md

@@ -0,0 +1,51 @@
+# Agent Note: Record the resume process boundary in the session log
+
+Status: rejected — the boundary belongs at the seeded-`Session` constructor, which also covers fork and replay; superseded by [the end-seed boundary](../../implemented/architecture/2026-07-30-session-end-seed-log-boundary.md)
+
+English | [中文](2026-07-29-session-resumed-log-boundary.zh.md)
+
+## Problem
+
+A session's durable log gave no evidence that it had changed processes. `session/created`, `session/disposed`, and `session/flush` are cordis runtime signals rather than `SessionEventMap` members, and `agent/session-start` carries a `SessionStartSource` but is emit-only and never logged. Reading a stored log therefore gave no hint that anything had been resumed.
+
+That gap makes one class of question unanswerable. A plugin that owns a standalone open/close pair in the log — compaction's `compact/start` … `compact/end` is the only one today — must distinguish an unmatched opening marker left by a process that died mid-operation from one an operation is holding right now. Those two states are **byte-identical in stored history**. Without a boundary the owner has to choose between refusing forever (an unmatched marker wedges the operation permanently, and because automatic compaction failure is warn-and-continue the user-visible result is that compaction silently stops working until the context window overflows) and proceeding always (which defeats the point of holding a lock).
+
+The pressure to fix this is immediate: moving `compact/start` to its real time point, before summarization, widens the crash window from a few microseconds of synchronous appends to the length of a whole model call, so orphaned brackets go from rare to routine.
+
+## Proposal
+
+`@deepseek-ai/dsh-session-persistence` declares one log-only `session/resumed` with an empty payload and appends exactly one at the end of every cold load, in the same `commitRepair` batch as any crash-repair closers and positioned after them — so every event before the boundary has a smaller seq and was written by a writer that is no longer tracking this log. Ownership lands narrowly on `loadCore()`, the cold-load path reached by `load()` and by `adopt()`. `loadLiveSnapshot()` appends nothing, and the non-mutating `inspect()`/`readFrom()` reads never write one.
+
+The predicate a bracket owner evaluates is purely a function of the log: an unmatched opening marker with a `session/resumed` after it is stale, and one with no `session/resumed` after it is live.
+
+`time` is `Date.now()` floored at the log's greatest `time`, deliberately unlike the synthetic closers, which reuse the last real event's timestamp so repair output stays a deterministic function of stored history. The wall clock is not monotonic — an NTP step, a VM restore, or a log copied from a machine that was ahead can put it behind events already stored — so the floor keeps every cross-boundary duration non-negative. The floor is durable, because the clamped boundary is stored and joins the log's maximum: one future-dated event pins every later boundary in that log to the same instant until wall time passes it.
+
+**The predicate distinguishes process succession, not concurrent writers.** `load()`'s liveness guard is `ctx.sessions.get(id)`, which only sees sessions live in *this* runtime, and no backend takes a cross-process per-session lock. So process B cold-loading a session A currently owns writes a boundary after A's still-open bracket. A consumer that must tolerate concurrent writers still needs a liveness signal beyond the log.
+
+## Why this was rejected
+
+Two reasons, found while reviewing where the marker belonged.
+
+**It covers no fork.** `sessions.fork()` and a subagent fork child construct a seeded session without touching persistence, so neither gets a boundary. A forked child inherits its parent's prefix verbatim — including an open `compact/start` the parent is still holding — which is the one case where the inherited bracket's owner is demonstrably alive. The predicate was unavailable exactly where it was most needed.
+
+**Minting the marker at load made a read path a durable write.** Every consequence the review surfaced traced to that: a revision bump on every cold load, a `commitRepair` batch on a balanced log with nothing to repair, the durable time floor above, a load that fails against a read-only store, and a marked log after a resume the caller then cancelled. None of these are wrong given the placement; they are the placement's cost.
+
+The successor keeps the problem statement and the concurrent-writer scope limit unchanged, and moves the write to `Session`'s constructor — the single waist all six seeded-start paths pass through, fork included. Because the marker then rides the ordinary seed-persistence path, the whole durable-write surface above disappears.
+
+## Alternatives considered
+
+**Use `Session.firstLiveSeq` as the staleness predicate.** Dismissed here on the grounds that it is documented as deliberately not persisted, so the same stored log yields different answers in different processes and a read-only reader cannot evaluate it at all. That reasoning was sound about the field and wrong about the conclusion: the fix is to persist a projection of it rather than to compute the boundary somewhere else. This is the alternative that became the successor.
+
+**Declare the event in core (`dsh-session`).** Rejected here because "the constructor cannot distinguish resume from fork or replay." That is true and turned out not to matter — the distinction is not needed, since inherited history is dead history in all three cases.
+
+**Teach `interruptedTurnClosers` to close `compact/*`.** Rejected: `compact/*` is plugin-owned vocabulary and core must not know it. Core closes turn, step, and tool boundaries — the relations it owns. The successor keeps this rejection.
+
+**Lazy self-repair: the owner appends a synthetic closing marker when it finds an orphan.** A write inside a read-shaped check, and it needs an invariant exception for a numbered owner whose turn has already closed.
+
+**A merge-extensible repair-contributor registry in core.** The right shape once a second consumer exists; with one consumer today, `packages/AGENTS.md` says not to split a seam preemptively.
+
+**Write the boundary only when repair actually occurred.** Rejected: the predicate must hold for an orderly restart too, where there is nothing to repair. The successor keeps this rejection.
+
+## Related
+
+The cold-session `updatedAt` skew this proposal documented is scoped in [the last-activity-index Agent Note](../../proposed/architecture/2026-07-29-durable-last-activity-index.md). That defect predates this proposal and survives its rejection: it is caused by mtime counting every durable write, not by any one boundary.

.agents/notes/rejected/architecture/2026-07-29-session-resumed-log-boundary.zh.md

@@ -0,0 +1,51 @@
+# Agent Note: 在会话日志中记录恢复的进程边界
+
+Status: rejected — 边界应当落在带种子 `Session` 的构造函数上，那里同时覆盖 fork 与回放；由[种子结束边界](../../implemented/architecture/2026-07-30-session-end-seed-log-boundary.md)取代
+
+[English](2026-07-29-session-resumed-log-boundary.md) | 中文
+
+## Problem
+
+会话的持久日志此前无法证明它换过进程。`session/created`、`session/disposed` 和 `session/flush` 是 cordis 运行时信号，而不是 `SessionEventMap` 成员；`agent/session-start` 虽然携带 `SessionStartSource`，却只用于 emit，从不记录。因此，读取一份已存储日志得不到任何关于「曾经发生过恢复」的线索。
+
+这一空缺让一类问题无法回答。在日志中拥有独立开始／结束事件对的插件必须区分两种未匹配的起始标记：一种由某个在操作中途死亡的进程留下，另一种正被当前某项操作持有；今天符合这一形态的只有压缩的 `compact/start` … `compact/end`。这两种状态**在已存储历史中逐字节相同**。没有边界，所有方只能在两种做法之间选择：永远拒绝（一个未匹配的标记会永久卡住该操作，而自动压缩失败采取警告并继续的策略，因此用户可见的结果是压缩静默停止工作，直到上下文窗口溢出），或者始终继续（这让持有锁失去了意义）。
+
+修复它的压力是即刻的：把 `compact/start` 移到摘要生成之前这个真实的时间点，会把崩溃窗口从几微秒的同步追加扩大为一整次模型调用的时长，孤儿括号也就从罕见变为常态。
+
+## Proposal
+
+`@deepseek-ai/dsh-session-persistence` 声明唯一一个纯日志事件 `session/resumed`，其载荷为空，并在每次冷加载结束时恰好追加一条：与崩溃修复产生的 closers 同处一个 `commitRepair` 批次，且排在它们之后。因此，该边界之前的每个事件都有更小的 seq，并且都是由一个不再追踪这份日志的写入方写下的。所有权狭窄地落在 `loadCore()`，也就是 `load()` 与 `adopt()` 到达的冷加载路径。`loadLiveSnapshot()` 不追加任何内容，非变更性的 `inspect()`／`readFrom()` 读取也从不写入。
+
+括号所有方求值的谓词纯粹是日志的函数：未匹配的起始标记之后有 `session/resumed` 的就是陈旧的，之后没有的就是存活的。
+
+`time` 取 `Date.now()` 并以日志的最大 `time` 为下限，刻意区别于合成 closers——后者复用最后一个真实事件的时间戳，以便修复输出始终是已存储历史的确定性函数。挂钟并非单调：一次 NTP 跳变、一次虚拟机恢复，或一份从走快的机器上拷来的日志，都可能让它落在已存储事件之后，因此这个下限让跨边界的时长都非负。该下限是持久的，因为被钳制的边界本身会被存储并加入日志的最大值：一个未来时间的事件会把该日志中之后的每个边界都钉在同一时刻，直到挂钟时间越过它。
+
+**该谓词区分的是进程接替，不是并发写入方。** `load()` 的存活性守卫是 `ctx.sessions.get(id)`，它只看到*本*运行时中存活的会话，而且没有任何后端会取跨进程的按会话锁。因此，进程 B 冷加载一个 A 当前拥有的会话时，会在 A 仍然开放的括号之后写入一个边界。必须容忍并发写入方的消费方仍然需要日志之外的存活信号。
+
+## 为什么被否决
+
+两个原因，都是在复审标记应当落在何处时发现的。
+
+**它完全覆盖不到 fork。** `sessions.fork()` 与子代理 fork 子会话在不触及持久化的情况下构造带种子会话，因此两者都拿不到边界。fork 子会话会逐字节继承父会话的前缀——包括父会话仍然持有的开放 `compact/start`——而这恰恰是继承括号的所有方明显还活着的唯一情形。谓词偏偏在最需要它的地方不可用。
+
+**在加载时铸造标记，把读取路径变成了持久写入。** 复审暴露出的每一项后果都源于此：每次冷加载都递增 revision、对一份无需修复的平衡日志也要走 `commitRepair`、上文那个持久时间下限、加载在只读存储上会失败，以及调用方随后取消的恢复也已留下标记。这些在该放置方式下都不算错，它们就是该放置方式的成本。
+
+取代方案保留问题陈述与并发写入方的适用范围限制不变，并把写入移到 `Session` 的构造函数——全部六条带种子启动路径（含 fork）必经的唯一收窄处。由于标记随后走普通的种子持久化路径，上述整个持久写入面就消失了。
+
+## Alternatives considered
+
+**用 `Session.firstLiveSeq` 作为陈旧性谓词。** 此处以「文档明确它有意不做持久化，因此同一份已存储日志在不同进程中会给出不同答案，而只读读取方根本无法对它求值」为理由否决。这个推理对字段本身是成立的，但结论错了：正确的修法是持久化它的一个投影，而不是把边界挪到别处去算。这条替代方案正是后来的取代方案。
+
+**在核心（`dsh-session`）中声明该事件。** 此处以「构造函数无法把恢复与 fork 或回放区分开」为理由否决。这句话是对的，但事实证明它无关紧要——并不需要这种区分，因为在这三种情形下继承历史都是死历史。
+
+**教 `interruptedTurnClosers` 关闭 `compact/*`。** 否决：`compact/*` 是插件所属词汇，核心不得知道它。核心只关闭轮次、步骤和工具边界，也就是它自己拥有的关系。取代方案保留这条否决。
+
+**惰性自修复：所有方发现孤儿时自行追加一条合成的关闭标记。** 这是在一次形似读取的检查中执行写入，而且需要为一个带轮次编号、其轮次却已经关闭的所有方开一个不变式例外。
+
+**在核心中建一个可合并扩展的修复贡献方注册表。** 一旦出现第二个消费方，这就是正确的形状；今天只有一个消费方，而 `packages/AGENTS.md` 要求不要预先拆分 seam。
+
+**仅在确实发生了修复时才写入边界。** 否决：该谓词对有序重启同样必须成立，而那时没有任何东西需要修复。取代方案保留这条否决。
+
+## 相关
+
+本提案记录过的冷会话 `updatedAt` 偏斜，范围界定在[最后活动索引 Agent Note](../../proposed/architecture/2026-07-29-durable-last-activity-index.md)。该缺陷早于本提案存在，并且在本提案被否决后依然存在：它的成因是 mtime 会计入每一次持久写入，而不是某一个边界。

apps/web/tests/live-interactions.e2e.ts

@@ -167,6 +167,9 @@ describe('web e2e: live-turn interactions (cancel / error / retry)', () => {
     // "no crash, composer recovers, turn logged as error".
     await expect.poll(() => page.locator('textarea').first().isEnabled(), { timeout: 10_000 }).toBe(true)
     expect(await page.locator('[data-streaming="true"]').count()).toBe(0)
+    // The blank workspace also has an enabled composer. Wait for the driven
+    // session's only visible message before capturing its no-error-copy state.
+    await expect.poll(() => page.getByText(PROMPT, { exact: true }).first().isVisible(), { timeout: 10_000 }).toBe(true)
     // Golden of the same gap: the prompt bubble alone, no error copy in the
     // tree — the diff that changes when web-error-surface lands.
     const snapshot = await captureStableAria(page, '[class*="centerCol"]', scaffold!.workspaceCwd)

docs/config-catalog.md

@@ -116,9 +116,9 @@ Source: [`packages/core/agent-loop/src/index.ts:155`](../packages/core/agent-loo
 /**
  * Bundle config: each field forwarded verbatim to the child that owns it —
  * `agents` to the agent loop (an app that pre-creates no agents, like the ACP
- * bridge, simply omits it), `persona` and `toolOrder` to the system-prompt
- * plugin (the deployment's persona section and the explicit model-facing tool
- * order), the `tools` object to the tool registry (its presentation `mode`),
+ * bridge, simply omits it), `includeHarnessIdentity`, `persona`, and `toolOrder`
+ * to the system-prompt plugin (the fixed opener, deployment persona, and explicit
+ * model-facing tool order), the `tools` object to the tool registry (its presentation `mode`),
  * `dshHome` to bash environment and local skill discovery, `sessionTitle` to
  * the fallback title service, `skills` to the
  * skill registry/local provider/tool consumer, `workspaceContext` to the
@@ -131,13 +131,16 @@ Source: [`packages/core/agent-loop/src/index.ts:155`](../packages/core/agent-loo
  * workspace context instead requires an explicit byte budget or `false` because
  * it changes model-visible input. Producer opt-in stays producer-local:
  * `toolBash` configures bash only; independently composed producers keep their
- * own config.
+ * own config. Set `toolBash: false` when another plugin owns the model-facing
+ * `bash` name.
  */
 export interface Config {
   /** The agent-loop `agents` list (see dsh-agent-loop's `Config`). */
   agents?: AgentLoopConfig['agents']
   /** Agent-loop concurrency cap; `1` is serial. */
   maxParallelToolCalls?: AgentLoopConfig['maxParallelToolCalls']
+  /** Whether the system prompt includes the fixed Harness identity (default true). */
+  includeHarnessIdentity?: SystemPromptConfig['includeHarnessIdentity']
   /** The deployment persona (see dsh-system-prompt's `Config`). */
   persona?: SystemPromptConfig['persona']
   /** The explicit model-facing tool order (see dsh-system-prompt's `Config`). */
@@ -150,10 +153,14 @@ export interface Config {
   sessionTitle?: SessionTitleConfig
   /** Workspace-context loader controls with an explicit byte budget; set `false` for hermetic prompts. */
   workspaceContext: workspaceContext.Config | false
-  /** Skill registry, local provider, and model-facing consumer config. */
+  /**
+   * Skill registry, local provider, and model-facing consumer config.
+   * Skills use `enabled` because one nested config controls a provider stack;
+   * single model-tool plugins use `Config | false` to disable that one consumer.
+   */
   skills?: SkillConfig
-  /** Model-facing bash tool config, including this producer's background opt-in. */
-  toolBash?: toolBash.Config
+  /** Model-facing bash tool config, or false when another plugin owns `bash`. */
+  toolBash?: toolBash.Config | false
   /** Generic background-task controls; set false to keep the task service without model-facing task tools. */
   toolTasks?: toolTasks.Config | false
   /** Global enablement and package-name filters for invariant companions. */
@@ -185,7 +192,7 @@ export interface GoalConfig {
 
 Depends on: [`AgentLoopConfig`](#deepseek-aidsh-agent-loop) · [`GoalDomainConfig`](#deepseek-aidsh-goal) · [`InvariantConfig`](#deepseek-aidsh-invariants) · [`SessionTitleConfig`](#deepseek-aidsh-session-title) · [`SkillLocal`](../packages/skill/skill-local/src/index.ts) · [`SkillRegistryConfig`](#deepseek-aidsh-skill) · [`SystemPromptConfig`](#deepseek-aidsh-system-prompt) · [`toolBash`](../packages/bash/tool-bash/src/index.ts) · [`toolGoal`](../packages/goal/tool-goal/src/index.ts) · [`ToolsConfig`](#deepseek-aidsh-tools) · [`toolSkill`](../packages/skill/tool-skill/src/index.ts) · [`toolTasks`](../packages/tasks/tool-tasks/src/index.ts) · [`workspaceContext`](../packages/context/workspace-context/src/index.ts)
 
-Source: [`packages/examples/agent-spine-demo/src/index.ts:88`](../packages/examples/agent-spine-demo/src/index.ts)
+Source: [`packages/examples/agent-spine-demo/src/index.ts:89`](../packages/examples/agent-spine-demo/src/index.ts)
 
 ## `@deepseek-ai/dsh-bash-local`
 
@@ -1521,6 +1528,8 @@ Source: [`packages/subagent/subagent-spawn/src/index.ts:20`](../packages/subagen
 ```ts config-catalog
 /** Plugin config: the deployment-authored fragment of the system prompt (see {@link Config.persona} for its contract). */
 export interface Config {
+  /** Include the fixed DeepSeek Harness identity before the deployment persona (default true). */
+  includeHarnessIdentity?: boolean
   /**
    * Deployment-wide order-0 persona template. A scoped section named
    * `deployment:persona` shadows it; `{{variable}}` references are strict.
@@ -1592,6 +1601,26 @@ export interface Config {
 
 Source: [`packages/bash/tool-bash/src/index.ts:41`](../packages/bash/tool-bash/src/index.ts)
 
+## `@deepseek-ai/dsh-tool-bash-persistent`
+
+Requires: `tools` · `pty`
+
+```ts config-catalog
+/** Configuration for the persistent Bash tool. */
+export interface Config {
+  /** PTY backend used for each owner-isolated persistent shell (default `shell`). */
+  backendType?: string
+  /** Wall-clock limit for one command (default 300000). */
+  timeoutMs?: number
+  /** Maximum returned command-output characters before clipping (default 16000). */
+  maxOutputChars?: number
+  /** Model-facing tool description; deployments may describe their environment. */
+  description?: string
+}
+```
+
+Source: [`packages/pty/tool-bash-persistent/src/index.ts:405`](../packages/pty/tool-bash-persistent/src/index.ts)
+
 ## `@deepseek-ai/dsh-tool-cordis`
 
 Requires: `tools`
@@ -1750,6 +1779,22 @@ export interface Config {
 
 Source: [`packages/skill/tool-skill/src/index.ts:30`](../packages/skill/tool-skill/src/index.ts)
 
+## `@deepseek-ai/dsh-tool-str-replace-editor`
+
+Requires: `tools` · `fs`
+
+```ts config-catalog
+/** Configuration for the string-replacement editor tool. */
+export interface Config {
+  /** Maximum returned view characters before clipping (default 16000). */
+  maxOutputChars?: number
+  /** Model-facing tool description. */
+  description?: string
+}
+```
+
+Source: [`packages/fs/tool-str-replace-editor/src/index.ts:496`](../packages/fs/tool-str-replace-editor/src/index.ts)
+
 ## `@deepseek-ai/dsh-tool-subagent`
 
 Requires: `tools` · `subagents`

docs/cordis-catalog/services.md

@@ -1590,7 +1590,7 @@ fork(source: SessionForkSource, boundary?: number, childSessionId?: SessionId):
 
 Types: [CreateSessionOptions](../core-data-structures/persistence.md) · [Session](../core-data-structures/session.md) · [SessionId](../core-data-structures/core.md)
 
-Source: [`packages/core/session/src/index.ts:695`](../../packages/core/session/src/index.ts)
+Source: [`packages/core/session/src/index.ts:713`](../../packages/core/session/src/index.ts)
 
 ## `ctx.sessionTitle` — `SessionTitleService`
 
@@ -1901,7 +1901,7 @@ async assemble(context: AssembleContext = {}): Promise<PromptAssembly>
 
 Types: [AssembleContext](../core-data-structures/system-prompt.md) · [PromptSection](../core-data-structures/system-prompt.md) · [ToolProviderResult](../core-data-structures/system-prompt.md)
 
-Source: [`packages/core/system-prompt/src/index.ts:246`](../../packages/core/system-prompt/src/index.ts)
+Source: [`packages/core/system-prompt/src/index.ts:248`](../../packages/core/system-prompt/src/index.ts)
 
 ## `ctx.tasks` — `TaskService` (abstract seam)
 
@@ -2197,7 +2197,7 @@ The concrete provider retains pi-tui, focus, and terminal lifecycle state. Plugi
 abstract openOverlay(request: TuiOverlayRequest): TuiOverlaySession
 ```
 
-Source: [`packages/ui/tui/src/index.ts:247`](../../packages/ui/tui/src/index.ts)
+Source: [`packages/ui/tui/src/index.ts:248`](../../packages/ui/tui/src/index.ts)
 
 ## `ctx.typert` — `TypertRegistry`
 

docs/core-data-structures/session.i18n.yaml

@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write docs/core-data-structures/session.md
-session.md: fd8285eebd76e8bd7723ee86ae15427f4923f4d6
-session.zh.md: 1033bfda117b5693421f0bdf4ec3fc136039f223
+session.md: 769d5db301e3e81664c732ab1685c859a00cceb2
+session.zh.md: 7af459949eda1b939596c20adf1c9e55f6d2b2b4

docs/core-data-structures/session.md

@@ -91,6 +91,29 @@ interface SessionEventMap {
    * It is log-only; the latest snapshot reconstructs the request header.
    */
   'request/header': { header: EpochHeader; reason: RequestHeaderReason }
+  /**
+   * Marks the end of a constructor seed. Events before it have smaller seq
+   * values and came from the seed (resume, fork, or replay); this lifecycle
+   * produced none of them. This log-only event is the durable projection of
+   * {@link Session.firstLiveSeq}. Its payload is empty — position and `time`
+   * carry the meaning.
+   *
+   * Locate the LAST one in stored history. A seed already ending in one is not
+   * re-marked, so reopening an untouched session does not grow its log per
+   * pickup and the event need not be at the current `firstLiveSeq`.
+   *
+   * `Session`'s constructor is the only legitimate writer. The invariant
+   * companion deliberately constrains nothing here, so a plugin appending one
+   * would silently classify every live bracket before it as seed history.
+   *
+   * An owner of a standalone open/close bracket (`compact/start` …
+   * `compact/end`) reads it because seed history and live work are otherwise
+   * byte-identical: an unmatched opening marker before this event belongs to
+   * an ended lifecycle, whatever ended it. NOT a liveness signal about other
+   * writers — a concurrently live session holds its own boundary elsewhere,
+   * so tolerating concurrent writers needs a signal beyond the log.
+   */
+  'session/end-seed': Record<string, never>
 }
 ```
 
@@ -320,14 +343,25 @@ declare class Session {
   get id(): SessionId;
   /**
    * The first seq appended IN THIS PROCESS: the length of the constructor
-   * seed (0 without one). Events below it entered through construction —
-   * replay, fork, or resume — and were never published on the `session/event`
-   * firehose (constructor seeds do not emit), so consumers that replay the
-   * log as a publication substitute (telemetry adoption) start here. Distinct
-   * from `header.seedLength`, the DURABLE fork-lineage boundary: a resumed
-   * session's constructor seed is its full stored log, while its header keeps
-   * the original fork value — this field is the in-process construction fact
-   * and is deliberately not persisted.
+   * seed (0 without one). Events with smaller seq values entered through
+   * construction — replay, fork, or resume — and were never published on the
+   * `session/event` firehose (constructor seeds do not emit), so consumers
+   * that replay the log as a publication substitute (telemetry adoption)
+   * start here. Distinct from `header.seedLength`, the DURABLE fork-lineage
+   * boundary: a resumed session's constructor seed is its full stored log,
+   * while its header keeps the original fork value — this field is the
+   * in-process construction fact.
+   *
+   * Not persisted itself: a seeded session projects it into the log as the
+   * `session/end-seed` event, which is what a consumer reading STORED history
+   * reads. Locate the LAST such event, not necessarily one at this seq — a
+   * seed already ending in one is not re-marked, so reopening an untouched
+   * session leaves that event at a smaller seq than `firstLiveSeq`. Prefer
+   * this field in-process: it is exact before the marker reaches storage.
+   *
+   * When this lifecycle appends the marker, it occupies this seq before the
+   * store attaches and therefore does not publish either. Otherwise this seq
+   * holds an ordinary published write.
    */
   readonly firstLiveSeq: number;
   constructor(id: SessionId, seed?: readonly SessionEvent[], header?: SessionHeader);
@@ -507,6 +541,16 @@ A turn encloses one model-loop execution, not the whole session log. Idle inject
 
 The optional `dsh-session/invariant` companion enforces the relations owned by core: turn and step numbering, execution-event enclosure, and same-step tool call/result pairing. Merge-extensible event relations belong to the plugin that declares them, so core does not reject an unknown event merely because no turn is open. See [the standalone-event decision](../../.agents/notes/implemented/simplification/2026-07-28-remove-synthetic-log-only-turns.md).
 
+## The end-seed boundary: `session/end-seed`
+
+A seeded session — resume, fork, or replay — appends this log-only event immediately after its constructor seed, as its first live write. Events before it have smaller seq values and came from the seed. It is the durable projection of `firstLiveSeq`: that field answers where this lifecycle's writes start for a consumer holding the object, while the event answers the same question for one holding only stored bytes. The payload is empty, so position and `time` carry the whole meaning, and it produces no message. `Session`'s constructor is the only legitimate writer.
+
+An empty seed writes nothing, and a seed already ending in `session/end-seed` is not re-marked, so reopening an untouched session does not grow its log per pickup. Locate the LAST `session/end-seed` in stored history rather than assuming one exists at `firstLiveSeq`: after a pickup with no work, the event has a smaller seq than the next lifecycle's `firstLiveSeq`.
+
+It exists because seed history and live work are otherwise byte-identical, which defeats any plugin owning a standalone open/close bracket: an unmatched `compact/start` reads the same whether the writer crashed mid-compaction or is compacting right now. An opening marker before `session/end-seed` came from the constructor seed and belongs to an ended lifecycle, whatever ended it (a crash, a succeeding process, or a fork out of a still-running parent), so its owner may treat it as dead. That covers only brackets *this* session inherited: a concurrently live session holding an open bracket over the same history has its own boundary elsewhere, so tolerating concurrent writers needs a liveness signal beyond the log. Core writes the boundary and reads nothing from it — a bracket's vocabulary stays with its owning plugin, which is why crash repair closes turn/step/tool boundaries and never `compact/*`.
+
+Activity ordering excludes the boundary through `lastActivityTime(events)`: picking a session up is not work, and lazy resume means browsing writes one, so a resume picker or session list ordering by log tail would float every opened session to the top.
+
 ## Plugin-contributed log-only events
 
 A plugin may declaration-merge extra `SessionEventMap` types. These are **log-only**: NOT `SurfaceEventType`s (they carry no `surfaceOp` and contribute nothing to derived history). Their owner decides whether they belong to an open execution turn or may stand between turns, and enforces any relation in its own invariant companion. The full per-event enumeration — core and plugin-contributed alike, with payloads and provenance — is the generated [persistence log event catalog](../persistence-catalog.md); the compaction seam's `compact/*` semantics are discussed on [compaction.md](compaction.md).

docs/core-data-structures/session.zh.md

@@ -91,6 +91,29 @@ interface SessionEventMap {
    * It is log-only; the latest snapshot reconstructs the request header.
    */
   'request/header': { header: EpochHeader; reason: RequestHeaderReason }
+  /**
+   * Marks the end of a constructor seed. Events before it have smaller seq
+   * values and came from the seed (resume, fork, or replay); this lifecycle
+   * produced none of them. This log-only event is the durable projection of
+   * {@link Session.firstLiveSeq}. Its payload is empty — position and `time`
+   * carry the meaning.
+   *
+   * Locate the LAST one in stored history. A seed already ending in one is not
+   * re-marked, so reopening an untouched session does not grow its log per
+   * pickup and the event need not be at the current `firstLiveSeq`.
+   *
+   * `Session`'s constructor is the only legitimate writer. The invariant
+   * companion deliberately constrains nothing here, so a plugin appending one
+   * would silently classify every live bracket before it as seed history.
+   *
+   * An owner of a standalone open/close bracket (`compact/start` …
+   * `compact/end`) reads it because seed history and live work are otherwise
+   * byte-identical: an unmatched opening marker before this event belongs to
+   * an ended lifecycle, whatever ended it. NOT a liveness signal about other
+   * writers — a concurrently live session holds its own boundary elsewhere,
+   * so tolerating concurrent writers needs a signal beyond the log.
+   */
+  'session/end-seed': Record<string, never>
 }
 ```
 
@@ -322,14 +345,25 @@ declare class Session {
   get id(): SessionId;
   /**
    * The first seq appended IN THIS PROCESS: the length of the constructor
-   * seed (0 without one). Events below it entered through construction —
-   * replay, fork, or resume — and were never published on the `session/event`
-   * firehose (constructor seeds do not emit), so consumers that replay the
-   * log as a publication substitute (telemetry adoption) start here. Distinct
-   * from `header.seedLength`, the DURABLE fork-lineage boundary: a resumed
-   * session's constructor seed is its full stored log, while its header keeps
-   * the original fork value — this field is the in-process construction fact
-   * and is deliberately not persisted.
+   * seed (0 without one). Events with smaller seq values entered through
+   * construction — replay, fork, or resume — and were never published on the
+   * `session/event` firehose (constructor seeds do not emit), so consumers
+   * that replay the log as a publication substitute (telemetry adoption)
+   * start here. Distinct from `header.seedLength`, the DURABLE fork-lineage
+   * boundary: a resumed session's constructor seed is its full stored log,
+   * while its header keeps the original fork value — this field is the
+   * in-process construction fact.
+   *
+   * Not persisted itself: a seeded session projects it into the log as the
+   * `session/end-seed` event, which is what a consumer reading STORED history
+   * reads. Locate the LAST such event, not necessarily one at this seq — a
+   * seed already ending in one is not re-marked, so reopening an untouched
+   * session leaves that event at a smaller seq than `firstLiveSeq`. Prefer
+   * this field in-process: it is exact before the marker reaches storage.
+   *
+   * When this lifecycle appends the marker, it occupies this seq before the
+   * store attaches and therefore does not publish either. Otherwise this seq
+   * holds an ordinary published write.
    */
   readonly firstLiveSeq: number;
   constructor(id: SessionId, seed?: readonly SessionEvent[], header?: SessionHeader);
@@ -511,6 +545,16 @@ interface TurnEndReasonMap {
 
 可选的 `dsh-session/invariant` 配套插件会强制核心拥有的关系：轮次与步骤编号、执行事件封闭，以及同一步骤内的工具调用／结果配对。可合并扩展事件的关系由声明它的插件拥有，因此核心不会仅因没有开放轮次就拒绝未知事件。见[独立事件决策](../../.agents/notes/implemented/simplification/2026-07-28-remove-synthetic-log-only-turns.md)。
 
+## 种子结束边界：`session/end-seed`
+
+带种子的会话（恢复、fork 或回放）紧接构造种子之后追加这个仅日志事件，作为自己的第一次实时写入。在它之前的事件具有更小的 seq，且来自种子。它是 `firstLiveSeq` 的持久投影：该字段为持有对象的消费方回答本生命周期的写入从哪里开始，该事件则为只持有存储字节的消费方回答同一问题。payload 为空，因此位置与 `time` 承载全部含义，且不产生任何消息。`Session` 的构造函数是唯一合法的写入方。
+
+空种子不写入任何内容；种子本身已以 `session/end-seed` 结尾时不会重复标记，因此重新打开一个未被改动的会话不会每次拾起都增长日志。应定位存储历史中的最后一条 `session/end-seed`，而不是假定 `firstLiveSeq` 处一定有一条：在一次没有产生工作的拾起之后，该事件的 seq 会小于下一个生命周期的 `firstLiveSeq`。
+
+它之所以必要，是因为种子历史与实时工作在字节层面完全相同，这会让任何拥有独立开／闭括号的插件失效：一个未配对的 `compact/start`，无论写入方是在压缩中途崩溃、还是此刻正在压缩，读起来都一样。在 `session/end-seed` 之前的开启标记来自构造种子，并且属于一个已结束的生命周期，无论结束原因为何（崩溃、进程接替，或从仍在运行的父会话 fork 出来），因此其所有方可以视之为已死。这只覆盖*本*会话继承的括号：另一个并发存活的会话可能在同一段历史上持有开放括号，而它自己的边界在别处，因此容忍并发写入方还需要日志之外的存活信号。核心写入该边界但不从中读取任何内容——括号的词汇表仍归其所属插件，这也正是崩溃修复只关闭轮次／步骤／工具边界而从不处理 `compact/*` 的原因。
+
+活动排序通过 `lastActivityTime(events)` 排除该边界：接手会话不算工作，而惰性恢复意味着浏览就会写入一个，因此按日志尾部排序的恢复选择器或会话列表会把每个打开过的会话顶到最前。
+
 ## 插件贡献的仅日志事件
 
 插件可以通过 declaration merging 添加额外的 `SessionEventMap` 类型。这些是**仅日志**事件：不是 `SurfaceEventType`（不携带 `surfaceOp`，不参与派生历史）。事件所有方决定它们属于一个开放的执行轮次，还是可以独立位于轮次之间，并在自己的不变量配套插件中强制所需关系。完整的逐事件枚举（核心与插件贡献的，含 payload 与溯源信息）见生成的[持久化日志事件目录](../persistence-catalog.md)；压缩 seam 的 `compact/*` 语义在 [compaction.md](compaction.md) 中讨论。

docs/event-producer-consumer.md

@@ -27,9 +27,9 @@ This matrix shows which packages dispatch each harness-owned event and which pac
 | `approval/request` | `waterfall` | [`packages/ui/user-approval/src/index.ts:30`](../packages/ui/user-approval/src/index.ts) | [`user-approval`](../packages/ui/user-approval) (`waterfall`) | [`acp`](../packages/acp/acp), `apiproxy` |
 | `commands/change` | `emit` | [`packages/ui/commands/src/index.ts:154`](../packages/ui/commands/src/index.ts) | [`commands`](../packages/ui/commands) (`events.dispatch`) | `apiproxy`, [`tui`](../packages/ui/tui) |
 | `domain/changed` | `emit` | [`packages/storage/storage-domain/src/events.ts:46`](../packages/storage/storage-domain/src/events.ts) | [`storage-domain`](../packages/storage/storage-domain) (`emit`) | `apiproxy`, [`storage-domain`](../packages/storage/storage-domain), [`workspace`](../packages/workspace/workspace) |
-| `fs/edit-intent` | `waterfall` | [`packages/fs/fs/src/index.ts:62`](../packages/fs/fs/src/index.ts) | [`tool-fs`](../packages/fs/tool-fs) (`waterfall`) | [`fs-policy`](../packages/fs/fs-policy) |
-| `fs/observed` | `emit` | [`packages/fs/fs/src/index.ts:71`](../packages/fs/fs/src/index.ts) | [`tool-fs`](../packages/fs/tool-fs) (`emit`) | [`fs-policy`](../packages/fs/fs-policy), [`skill-local`](../packages/skill/skill-local) |
-| `fs/write-intent` | `waterfall` | [`packages/fs/fs/src/index.ts:54`](../packages/fs/fs/src/index.ts) | [`tool-fs`](../packages/fs/tool-fs) (`waterfall`) | [`fs-policy`](../packages/fs/fs-policy) |
+| `fs/edit-intent` | `waterfall` | [`packages/fs/fs/src/index.ts:62`](../packages/fs/fs/src/index.ts) | [`tool-fs`](../packages/fs/tool-fs) (`waterfall`), [`tool-str-replace-editor`](../packages/fs/tool-str-replace-editor) (`waterfall`) | [`fs-policy`](../packages/fs/fs-policy) |
+| `fs/observed` | `emit` | [`packages/fs/fs/src/index.ts:71`](../packages/fs/fs/src/index.ts) | [`tool-fs`](../packages/fs/tool-fs) (`emit`), [`tool-str-replace-editor`](../packages/fs/tool-str-replace-editor) (`emit`) | [`fs-policy`](../packages/fs/fs-policy), [`skill-local`](../packages/skill/skill-local) |
+| `fs/write-intent` | `waterfall` | [`packages/fs/fs/src/index.ts:54`](../packages/fs/fs/src/index.ts) | [`tool-fs`](../packages/fs/tool-fs) (`waterfall`), [`tool-str-replace-editor`](../packages/fs/tool-str-replace-editor) (`waterfall`) | [`fs-policy`](../packages/fs/fs-policy) |
 | `goal/changed` | `emit` | [`packages/goal/goal/src/domain.ts:135`](../packages/goal/goal/src/domain.ts) | [`goal`](../packages/goal/goal) (`emit`) | [`goal-session`](../packages/goal/goal-session) |
 | `llm/stream` | `waterfall` | [`packages/llm/llm/src/index.ts:58`](../packages/llm/llm/src/index.ts) | [`llm`](../packages/llm/llm) (`waterfall`) | [`agent-loop`](../packages/core/agent-loop), [`llm`](../packages/llm/llm), [`llm-replay`](../packages/support/llm-replay), [`session-checkpoint-policy`](../packages/session-persistence/session-checkpoint-policy), [`session-title`](../packages/session-title/session-title) |
 | `session/created` | `emit` | [`packages/core/session/src/index.ts:71`](../packages/core/session/src/index.ts) | [`session`](../packages/core/session) (`events.dispatch`) | `apiproxy`, [`compact`](../packages/compact/compact), [`goal`](../packages/goal/goal), [`hook-protocol`](../packages/hooks/hook-protocol), [`jsonrpc`](../packages/ui/jsonrpc), [`llm-retry`](../packages/llm/llm-retry), [`plan-mode`](../packages/plan/plan-mode), [`session`](../packages/core/session), [`session-persistence`](../packages/session-persistence/session-persistence), [`session-telemetry`](../packages/telemetry/session-telemetry), [`tools`](../packages/core/tools), [`user-approval`](../packages/ui/user-approval) |

docs/module-graph.md

@@ -48,6 +48,7 @@ flowchart TD
     pkg_fs_sandbox["fs-sandbox"]
     pkg_tool_fs["tool-fs"]
     pkg_tool_fs_search["tool-fs-search"]
+    pkg_tool_str_replace_editor["tool-str-replace-editor"]
   end
   subgraph group_skill["packages/skill"]
     pkg_skill["skill"]
@@ -204,6 +205,7 @@ flowchart TD
   subgraph group_pty["packages/pty"]
     pkg_pty["pty"]
     pkg_pty_local["pty-local"]
+    pkg_tool_bash_persistent["tool-bash-persistent"]
     pkg_tool_pty["tool-pty"]
   end
   subgraph group_sandbox["packages/sandbox"]
@@ -687,6 +689,11 @@ flowchart TD
   pkg_tool_fs_search --> pkg_spill
   pkg_tool_fs_search --> pkg_system_prompt
   pkg_tool_fs_search --> pkg_tools
+  pkg_tool_str_replace_editor --> pkg_fs
+  pkg_tool_str_replace_editor --> pkg_invariants
+  pkg_tool_str_replace_editor --> pkg_sandbox
+  pkg_tool_str_replace_editor --> pkg_sandbox_policy
+  pkg_tool_str_replace_editor --> pkg_tools
   pkg_tool_skill --> pkg_agent
   pkg_tool_skill --> pkg_invariants
   pkg_tool_skill --> pkg_llm
@@ -807,6 +814,11 @@ flowchart TD
   pkg_mcp_client --> pkg_llm
   pkg_mcp_client --> pkg_subprocess
   pkg_mcp_client --> pkg_tools
+  pkg_tool_bash_persistent --> pkg_agent
+  pkg_tool_bash_persistent --> pkg_invariants
+  pkg_tool_bash_persistent --> pkg_pty
+  pkg_tool_bash_persistent --> pkg_timeout
+  pkg_tool_bash_persistent --> pkg_tools
   pkg_tool_pty --> pkg_agent
   pkg_tool_pty --> pkg_invariants
   pkg_tool_pty --> pkg_llm
@@ -1113,6 +1125,7 @@ flowchart TD
 | [`tool-bash`](../packages/bash/tool-bash) | `bash` | [`agent`](../packages/core/agent), [`bash`](../packages/bash/bash), [`invariants`](../packages/support/invariants), [`llm`](../packages/llm/llm), [`paths`](../packages/util/paths), [`sandbox`](../packages/sandbox/sandbox), [`sandbox-policy`](../packages/sandbox/sandbox-policy), [`session-persistence`](../packages/session-persistence/session-persistence), [`system-prompt`](../packages/core/system-prompt), [`tasks`](../packages/tasks/tasks), [`tools`](../packages/core/tools), [`user-approval`](../packages/ui/user-approval) |
 | [`tool-fs`](../packages/fs/tool-fs) | `fs` | [`fs`](../packages/fs/fs), [`invariants`](../packages/support/invariants), [`llm`](../packages/llm/llm), [`sandbox`](../packages/sandbox/sandbox), [`sandbox-policy`](../packages/sandbox/sandbox-policy), [`session`](../packages/core/session), [`system-prompt`](../packages/core/system-prompt), [`tools`](../packages/core/tools), [`user-approval`](../packages/ui/user-approval) |
 | [`tool-fs-search`](../packages/fs/tool-fs-search) | `fs` | [`bash`](../packages/bash/bash), [`invariants`](../packages/support/invariants), [`llm`](../packages/llm/llm), [`retention`](../packages/util/retention), [`session`](../packages/core/session), [`spill`](../packages/spill/spill), [`system-prompt`](../packages/core/system-prompt), [`tools`](../packages/core/tools) |
+| [`tool-str-replace-editor`](../packages/fs/tool-str-replace-editor) | `fs` | [`fs`](../packages/fs/fs), [`invariants`](../packages/support/invariants), [`sandbox`](../packages/sandbox/sandbox), [`sandbox-policy`](../packages/sandbox/sandbox-policy), [`tools`](../packages/core/tools) |
 | [`tool-skill`](../packages/skill/tool-skill) | `skill` | [`agent`](../packages/core/agent), [`invariants`](../packages/support/invariants), [`llm`](../packages/llm/llm), [`skill`](../packages/skill/skill), [`tools`](../packages/core/tools) |
 | [`subagent`](../packages/subagent/subagent) | `subagent` | [`agent`](../packages/core/agent), [`brand`](../packages/util/brand), [`invariants`](../packages/support/invariants), [`llm`](../packages/llm/llm), [`scope`](../packages/core/scope), [`session`](../packages/core/session), [`tools`](../packages/core/tools) |
 | [`tool-web`](../packages/web/tool-web) | `web` | [`invariants`](../packages/support/invariants), [`llm`](../packages/llm/llm), [`system-prompt`](../packages/core/system-prompt), [`tools`](../packages/core/tools), [`web`](../packages/web/web) |
@@ -1135,6 +1148,7 @@ flowchart TD
 | [`repeat-tool-guard`](../packages/guard/repeat-tool-guard) | `guard` | [`agent`](../packages/core/agent), [`invariants`](../packages/support/invariants), [`tools`](../packages/core/tools) |
 | [`tool-lsp`](../packages/lsp/tool-lsp) | `lsp` | [`invariants`](../packages/support/invariants), [`llm`](../packages/llm/llm), [`lsp`](../packages/lsp/lsp), [`system-prompt`](../packages/core/system-prompt), [`timeout`](../packages/util/timeout), [`tools`](../packages/core/tools) |
 | [`mcp-client`](../packages/mcp/mcp-client) | `mcp` | [`invariants`](../packages/support/invariants), [`llm`](../packages/llm/llm), [`subprocess`](../packages/subprocess/subprocess), [`tools`](../packages/core/tools) |
+| [`tool-bash-persistent`](../packages/pty/tool-bash-persistent) | `pty` | [`agent`](../packages/core/agent), [`invariants`](../packages/support/invariants), [`pty`](../packages/pty/pty), [`timeout`](../packages/util/timeout), [`tools`](../packages/core/tools) |
 | [`tool-pty`](../packages/pty/tool-pty) | `pty` | [`agent`](../packages/core/agent), [`invariants`](../packages/support/invariants), [`llm`](../packages/llm/llm), [`pty`](../packages/pty/pty), [`retention`](../packages/util/retention), [`system-prompt`](../packages/core/system-prompt), [`tasks`](../packages/tasks/tasks), [`tools`](../packages/core/tools) |
 | [`tool-tasks`](../packages/tasks/tool-tasks) | `tasks` | [`agent`](../packages/core/agent), [`invariants`](../packages/support/invariants), [`llm`](../packages/llm/llm), [`retention`](../packages/util/retention), [`system-prompt`](../packages/core/system-prompt), [`tasks`](../packages/tasks/tasks), [`tools`](../packages/core/tools) |
 | [`tool-workflow`](../packages/workflow/tool-workflow) | `workflow` | [`agent`](../packages/core/agent), [`invariants`](../packages/support/invariants), [`llm`](../packages/llm/llm), [`system-prompt`](../packages/core/system-prompt), [`tools`](../packages/core/tools), [`workflow`](../packages/workflow/workflow) |

docs/persistence-catalog.md

@@ -78,7 +78,7 @@ export type SessionEvent<T extends SessionEventType = SessionEventType> = {
 }[T]
 ```
 
-Sources: [`packages/core/session/src/types.ts:256`](../packages/core/session/src/types.ts) · [`packages/core/session/src/types.ts:263`](../packages/core/session/src/types.ts) · [`packages/core/session/src/types.ts:292`](../packages/core/session/src/types.ts) · [`packages/core/session/src/types.ts:324`](../packages/core/session/src/types.ts)
+Sources: [`packages/core/session/src/types.ts:279`](../packages/core/session/src/types.ts) · [`packages/core/session/src/types.ts:286`](../packages/core/session/src/types.ts) · [`packages/core/session/src/types.ts:315`](../packages/core/session/src/types.ts) · [`packages/core/session/src/types.ts:347`](../packages/core/session/src/types.ts)
 
 ## Events
 
@@ -404,6 +404,36 @@ Source: [`packages/sandbox/sandbox-policy/src/session-mode.ts:33`](../packages/s
 
 ### `session/*`
 
+#### `session/end-seed` — log-only
+
+```ts persistence-catalog
+/**
+ * Marks the end of a constructor seed. Events before it have smaller seq
+ * values and came from the seed (resume, fork, or replay); this lifecycle
+ * produced none of them. This log-only event is the durable projection of
+ * {@link Session.firstLiveSeq}. Its payload is empty — position and `time`
+ * carry the meaning.
+ *
+ * Locate the LAST one in stored history. A seed already ending in one is not
+ * re-marked, so reopening an untouched session does not grow its log per
+ * pickup and the event need not be at the current `firstLiveSeq`.
+ *
+ * `Session`'s constructor is the only legitimate writer. The invariant
+ * companion deliberately constrains nothing here, so a plugin appending one
+ * would silently classify every live bracket before it as seed history.
+ *
+ * An owner of a standalone open/close bracket (`compact/start` …
+ * `compact/end`) reads it because seed history and live work are otherwise
+ * byte-identical: an unmatched opening marker before this event belongs to
+ * an ended lifecycle, whatever ended it. NOT a liveness signal about other
+ * writers — a concurrently live session holds its own boundary elsewhere,
+ * so tolerating concurrent writers needs a signal beyond the log.
+ */
+'session/end-seed': Record<string, never>
+```
+
+Source: [`packages/core/session/src/types.ts:275`](../packages/core/session/src/types.ts)
+
 #### `session/title` — log-only
 
 ```ts persistence-catalog

docs/tool-catalog.md

@@ -20,6 +20,8 @@ This table connects model-visible tool names to the plugin package and service s
 | `@deepseek-ai/dsh-plan-mode` | `exit_plan_mode` | `ctx.tools`, `ctx.systemPrompt`, `ctx.userInteraction (execution time, opportunistic)` | `tool/call`, `plan/mode inactive on an approved review`, `tool/result` | - | exit_plan_mode stays in the model-facing schema while planning is inactive so transitions add no tool-catalog churn on top of the plan-policy change. Its execute path rejects calls outside plan mode; in plan mode it presents the plan over the user-interaction seam (approve / keep planning with feedback), and approval logs plan mode inactive at the step boundary. |
 | `@deepseek-ai/dsh-tool-bash` | `bash` | `ctx.tools`, `ctx.bash`, `ctx.tasks at call time for run_in_background` | `tool/call`, `tool/result` | - | The bash tool is the model-facing consumer of the bash executor seam. A `run_in_background` run registers with the generic `ctx.tasks` runtime and is collected/stopped through the `task_*` tools from `@deepseek-ai/dsh-tool-tasks`; the `enableRunInBackground` config (default true) removes the parameter entirely when disabled. |
 | `@deepseek-ai/dsh-tool-cordis` | `cordis_inspect`, `cordis_mount`, `cordis_unmount` | `ctx.tools` | `tool/call`, `tool/result`, `process-local temporary Plugin lifecycle` | - | Ships in examples/cordis-agent only (a deliberate opt-in — temporary Plugin code reaches the real runtime, see .agents/notes/implemented/feature/2026-07-08-self-referential-cordis-toolset.md). Plugins created by cordis_mount may register ADDITIONAL model-visible tools until unmounted or DSH restarts; a full changed request header logs those tool-set changes. |
+| `@deepseek-ai/dsh-tool-bash-persistent` | `bash` | `ctx.tools`, `ctx.pty`, `an owning Agent at execution time` | `tool/call`, `PTY shell state`, `tool/result` | - | One owner-isolated persistent bash tool; deployment composition supplies the PTY backend and may override the model-facing environment description. |
+| `@deepseek-ai/dsh-tool-str-replace-editor` | `str_replace_editor` | `ctx.tools`, `ctx.fs` | `tool/call`, `fs/observed after successful file operations`, `tool/result` | - | Standalone view/create/unique literal replace/line insert tool over the filesystem seam; it composes with any shell or terminal surface. |
 | `@deepseek-ai/dsh-tool-fs` | `edit`, `read`, `write` | `ctx.tools`, `ctx.fs`, `ctx.systemPrompt` | `tool/call`, `fs/write-intent or fs/edit-intent for mutations`, `fs/observed after successful file operations`, `tool/result` | - | The read-before-write/edit policy is added by `@deepseek-ai/dsh-fs-policy` (an `fs/*` event-gate plugin, no schema change); a deployment that loads these tools is expected to also load it. The tool schemas above are identical with or without the policy plugin. |
 | `@deepseek-ai/dsh-tool-fs-search` | `glob`, `grep` | `ctx.tools`, `ctx.bash`, `ctx.systemPrompt` | `tool/call`, `tool/result` | - | glob and grep are conditional bash-backed discovery tools: they register only when ctx.bash can find `rg`, then run fixed ripgrep commands through ctx.bash as ordinary foreground calls (never background tasks). Capped results save the complete formatted list through the optional ctx.spillStore backend; returned locators are follow-up-readable/searchable when the backend exposes local paths in co-located deployments. |
 | `@deepseek-ai/dsh-tool-pty` | `terminal_close`, `terminal_list`, `terminal_open`, `terminal_read`, `terminal_send`, `terminal_signal` | `ctx.tools`, `ctx.pty`, `ctx.systemPrompt`, `ctx.tasks at call time for run_in_background` | `tool/call`, `tool/result` | - | The six terminal tools are opt-in and complement one-shot bash/filesystem tools. `terminal_send(run_in_background: true)` registers with `ctx.tasks`; TUI, named key sequences, BEL, resize, auto-start, and cross-agent sharing are absent from the schema. |
@@ -279,6 +281,99 @@ Source: [`packages/cordis/tool-cordis/src/index.ts`](../packages/cordis/tool-cor
 
 Ships in examples/cordis-agent only (a deliberate opt-in — temporary Plugin code reaches the real runtime, see .agents/notes/implemented/feature/2026-07-08-self-referential-cordis-toolset.md). Plugins created by cordis_mount may register ADDITIONAL model-visible tools until unmounted or DSH restarts; a full changed request header logs those tool-set changes.
 
+## `@deepseek-ai/dsh-tool-bash-persistent`
+
+### `bash`
+
+Run commands in a persistent bash shell. State, including the current directory and exported environment variables, persists across calls for this agent.
+
+```json
+{
+  "type": "object",
+  "properties": {
+    "command": {
+      "type": "string",
+      "description": "The bash command to run. Relative path is preferred in the command."
+    }
+  },
+  "required": [
+    "command"
+  ]
+}
+```
+
+Source: [`packages/pty/tool-bash-persistent/src/index.ts`](../packages/pty/tool-bash-persistent/src/index.ts)
+
+One owner-isolated persistent bash tool; deployment composition supplies the PTY backend and may override the model-facing environment description.
+
+## `@deepseek-ai/dsh-tool-str-replace-editor`
+
+### `str_replace_editor`
+
+Custom editing tool for viewing, creating and editing files
+* State is persistent across command calls and discussions with the user
+* If `path` is a file, `view` displays the result of applying `cat -n`. If `path` is a directory, `view` lists non-hidden files and directories up to 2 levels deep
+* The `create` command cannot be used if the specified `path` already exists as a file
+* If a `command` generates a long output, it will be truncated and marked with `<response clipped>`
+
+Notes for using the `str_replace` command:
+* The `old_str` parameter should match EXACTLY one or more consecutive lines from the original file. Be mindful of whitespaces!
+* If the `old_str` parameter is not unique in the file, the replacement will not be performed. Make sure to include enough context in `old_str` to make it unique
+* The `new_str` parameter should contain the edited lines that should replace the `old_str`
+
+```json
+{
+  "type": "object",
+  "properties": {
+    "command": {
+      "type": "string",
+      "description": "The commands to run. Allowed options are: `view`, `create`, `str_replace`, `insert`.",
+      "enum": [
+        "view",
+        "create",
+        "str_replace",
+        "insert"
+      ]
+    },
+    "path": {
+      "type": "string",
+      "description": "Absolute path to file or directory, e.g. `/repo/file.py` or `/repo`."
+    },
+    "file_text": {
+      "type": "string",
+      "description": "Required parameter of `create` command, with the content of the file to be created."
+    },
+    "insert_line": {
+      "type": "integer",
+      "description": "Required parameter of `insert` command. The `new_str` will be inserted AFTER the line `insert_line` of `path`."
+    },
+    "new_str": {
+      "type": "string",
+      "description": "Optional parameter of `str_replace` command containing the new string (if not given, no string will be added). Required parameter of `insert` command containing the string to insert."
+    },
+    "old_str": {
+      "type": "string",
+      "description": "Required parameter of `str_replace` command containing the string in `path` to replace."
+    },
+    "view_range": {
+      "type": "array",
+      "description": "Optional parameter of `view` command when `path` points to a file. If none is given, the full file is shown. If provided, the file will be shown in the indicated line number range, e.g. [11, 12] will show lines 11 and 12. Indexing at 1 to start. Setting `[start_line, -1]` shows all lines from `start_line` to the end of the file.",
+      "items": {
+        "type": "integer"
+      }
+    }
+  },
+  "required": [
+    "command",
+    "path"
+  ]
+}
+```
+
+Source: [`packages/fs/tool-str-replace-editor/src/index.ts`](../packages/fs/tool-str-replace-editor/src/index.ts)
+
+Standalone view/create/unique literal replace/line insert tool over the filesystem seam; it composes with any shell or terminal surface.
+
 ## `@deepseek-ai/dsh-tool-fs`
 
 ### `edit`

examples/acp-agent/tests/snapshots/subagent-fork/session.1.jsonl

@@ -1,6 +1,6 @@
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+{"type":"user/message","seq":1,"time":1783352134838,"data":{"content":[{"type":"text","text":"Remember this fact for later: the project codeword is MARMALADE. Reply with the single word OK and stop. Do not use any tools."}],"source":{"kind":"user"},"role":"user","id":"ecede90b-f918-4b3c-81cc-aefcc375d269"},"surfaceOp":"append"}
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examples/acp-agent/tests/snapshots/subagent-mixed/session.2.jsonl

@@ -1,6 +1,6 @@
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-{"type":"turn/end","seq":78,"time":1785142306309,"data":{"turn":2,"reason":{"kind":"completed"}}}
+{"type":"session/end-seed","seq":32,"time":1785396258235,"data":{}}
+{"type":"turn/start","seq":33,"time":1785381573526,"data":{"turn":2,"trigger":{"kind":"message","source":{"kind":"user"}}}}
+{"type":"user/message","seq":34,"time":1785381573526,"data":{"content":[{"type":"text","text":"What is the project codeword mentioned earlier in this conversation? Reply with exactly that one word and nothing else."}],"source":{"kind":"user"},"role":"user","id":"9f252dc0-3b24-4607-b761-30711b726edb"},"surfaceOp":"append"}
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+{"type":"assistant/chunk","seq":37,"time":1783352147925,"data":{"turn":2,"step":1,"chunk":{"type":"block-start","index":0,"blockType":"reasoning"}}}
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+{"type":"text-chunks","seq0":70,"time0":1783352148313,"data":{"turn":2,"step":1,"index":1,"dt":[31,1],"texts":["SA","FF","RON"]}}
+{"type":"assistant/chunk","seq":73,"time":1783352148345,"data":{"turn":2,"step":1,"chunk":{"type":"block-end","index":0,"block":{"type":"reasoning","text":"The user is asking me to recall the project codeword that was mentioned earlier in the conversation. I was told to remember it: SAFFRON."}}}}
+{"type":"assistant/chunk","seq":74,"time":1783352148345,"data":{"turn":2,"step":1,"chunk":{"type":"block-end","index":1,"block":{"type":"text","text":"SAFFRON"}}}}
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+{"type":"assistant/chunk","seq":76,"time":1785381573552,"data":{"turn":2,"step":1,"chunk":{"type":"finish","reason":{"kind":"stop"}}}}
+{"type":"assistant/message","seq":77,"time":1785381573552,"data":{"turn":2,"step":1,"message":{"role":"assistant","content":[{"type":"reasoning","text":"The user is asking me to recall the project codeword that was mentioned earlier in the conversation. I was told to remember it: SAFFRON."},{"type":"text","text":"SAFFRON"}],"source":{"kind":"model","provider":"deepseek","model":"deepseek-v4-flash"},"id":"a39affbc-097b-4106-912a-99538d18eff8"},"usage":{"inputTokens":95,"outputTokens":35,"cacheReadTokens":2816,"reasoningTokens":31}},"sourceEventSeqs":[37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76],"surfaceOp":"append"}
+{"type":"step/end","seq":78,"time":1785381573553,"data":{"turn":2,"step":1}}
+{"type":"turn/end","seq":79,"time":1785381573553,"data":{"turn":2,"reason":{"kind":"completed"}}}

examples/headless-agent/tests/semantic-checkpoint-snapshots/tool-outcome-unknown/session.expected.jsonl

@@ -7,15 +7,16 @@
 {"type":"tool/result","seq":5,"time":0,"data":{"turn":1,"step":1,"message":{"id":"interrupted-tool-result-unknown-outcome-call-5","role":"user","source":{"kind":"tool","callId":"unknown-outcome-call"},"content":[{"type":"tool-result","toolCallId":"unknown-outcome-call","isError":true,"content":[{"type":"text","text":"The tool call was interrupted after it was recorded, but no result was durably recorded. Its outcome is unknown. Decide whether to retry from the tool semantics: retry only if the operation is read-only or idempotent; if it may have side effects, first verify external state or ask the user. Do not retry blindly."}]}]},"error":{"name":"ToolOutcomeUnknownError","code":"TOOL_OUTCOME_UNKNOWN"}},"surfaceOp":"append","sourceEventSeqs":[4]}
 {"type":"step/end","seq":6,"time":0,"data":{"turn":1,"step":1}}
 {"type":"turn/end","seq":7,"time":0,"data":{"turn":1,"reason":{"kind":"interrupted"}}}
-{"type":"turn/start","seq":8,"time":0,"data":{"turn":2,"trigger":{"kind":"message","source":{"kind":"user"}}}}
-{"type":"user/message","seq":9,"time":0,"data":{"content":[{"type":"text","text":"Continue safely from the interrupted operation."}],"source":{"kind":"user"},"role":"user","id":"{{sessionId}}"},"surfaceOp":"append"}
-{"type":"session/title","seq":10,"time":0,"data":{"title":"Perform one side-effecting remote mutati","messageSeqs":[1],"source":{"kind":"fallback"}}}
-{"type":"step/start","seq":11,"time":0,"data":{"turn":2,"step":1}}
-{"type":"request/header","seq":12,"time":0,"data":{"header":{"config":{"provider":"deepseek","model":"deepseek-v4-flash"},"system":"{{system}}","tools":"{{tools}}"},"reason":"initial"}}
-{"type":"assistant/chunk","seq":13,"time":0,"data":{"turn":2,"step":1,"chunk":{"type":"block-start","index":0,"blockType":"text"}}}
-{"type":"assistant/chunk","seq":14,"time":0,"data":{"turn":2,"step":1,"chunk":{"type":"text-delta","index":0,"text":"I will verify the external state before deciding whether to retry the side-effecting operation."}}}
-{"type":"assistant/chunk","seq":15,"time":0,"data":{"turn":2,"step":1,"chunk":{"type":"block-end","index":0,"block":{"type":"text","text":"I will verify the external state before deciding whether to retry the side-effecting operation."}}}}
-{"type":"assistant/chunk","seq":16,"time":0,"data":{"turn":2,"step":1,"chunk":{"type":"finish","reason":{"kind":"stop"}}}}
-{"type":"assistant/message","seq":17,"time":0,"data":{"turn":2,"step":1,"message":{"role":"assistant","content":[{"type":"text","text":"I will verify the external state before deciding whether to retry the side-effecting operation."}],"source":{"kind":"model","provider":"deepseek","model":"deepseek-v4-flash"},"id":"{{sessionId}}"}},"sourceEventSeqs":[13,14,15,16],"surfaceOp":"append"}
-{"type":"step/end","seq":18,"time":0,"data":{"turn":2,"step":1}}
-{"type":"turn/end","seq":19,"time":0,"data":{"turn":2,"reason":{"kind":"completed"}}}
+{"type":"session/end-seed","seq":8,"time":0,"data":{}}
+{"type":"turn/start","seq":9,"time":0,"data":{"turn":2,"trigger":{"kind":"message","source":{"kind":"user"}}}}
+{"type":"user/message","seq":10,"time":0,"data":{"content":[{"type":"text","text":"Continue safely from the interrupted operation."}],"source":{"kind":"user"},"role":"user","id":"{{sessionId}}"},"surfaceOp":"append"}
+{"type":"session/title","seq":11,"time":0,"data":{"title":"Perform one side-effecting remote mutati","messageSeqs":[1],"source":{"kind":"fallback"}}}
+{"type":"step/start","seq":12,"time":0,"data":{"turn":2,"step":1}}
+{"type":"request/header","seq":13,"time":0,"data":{"header":{"config":{"provider":"deepseek","model":"deepseek-v4-flash"},"system":"{{system}}","tools":"{{tools}}"},"reason":"initial"}}
+{"type":"assistant/chunk","seq":14,"time":0,"data":{"turn":2,"step":1,"chunk":{"type":"block-start","index":0,"blockType":"text"}}}
+{"type":"assistant/chunk","seq":15,"time":0,"data":{"turn":2,"step":1,"chunk":{"type":"text-delta","index":0,"text":"I will verify the external state before deciding whether to retry the side-effecting operation."}}}
+{"type":"assistant/chunk","seq":16,"time":0,"data":{"turn":2,"step":1,"chunk":{"type":"block-end","index":0,"block":{"type":"text","text":"I will verify the external state before deciding whether to retry the side-effecting operation."}}}}
+{"type":"assistant/chunk","seq":17,"time":0,"data":{"turn":2,"step":1,"chunk":{"type":"finish","reason":{"kind":"stop"}}}}
+{"type":"assistant/message","seq":18,"time":0,"data":{"turn":2,"step":1,"message":{"role":"assistant","content":[{"type":"text","text":"I will verify the external state before deciding whether to retry the side-effecting operation."}],"source":{"kind":"model","provider":"deepseek","model":"deepseek-v4-flash"},"id":"{{sessionId}}"}},"sourceEventSeqs":[14,15,16,17],"surfaceOp":"append"}
+{"type":"step/end","seq":19,"time":0,"data":{"turn":2,"step":1}}
+{"type":"turn/end","seq":20,"time":0,"data":{"turn":2,"reason":{"kind":"completed"}}}

examples/headless-agent/tests/subagent-inheritance-snapshots/parent-override/parent.expected.jsonl

@@ -3,26 +3,27 @@
 {"type":"user/message","seq":1,"time":0,"data":{"content":[{"type":"text","text":"Tighten this session to read-only."}],"source":{"kind":"user"},"role":"user","id":"{{sessionId}}"},"surfaceOp":"append"}
 {"type":"sandbox/mode","seq":2,"time":0,"data":{"mode":"read-only"}}
 {"type":"turn/end","seq":3,"time":0,"data":{"turn":1,"reason":{"kind":"completed"}}}
-{"type":"turn/start","seq":4,"time":0,"data":{"turn":2,"trigger":{"kind":"message","source":{"kind":"user"}}}}
-{"type":"user/message","seq":5,"time":0,"data":{"content":[{"type":"text","text":"Delegate the write probe to a subagent."}],"source":{"kind":"user"},"role":"user","id":"{{sessionId}}"},"surfaceOp":"append"}
-{"type":"session/title","seq":6,"time":0,"data":{"title":"Tighten this session to read-only.","messageSeqs":[1],"source":{"kind":"fallback"}}}
-{"type":"step/start","seq":7,"time":0,"data":{"turn":2,"step":1}}
-{"type":"request/header","seq":8,"time":0,"data":{"header":{"config":{"provider":"deepseek","model":"deepseek-v4-flash"},"system":"{{system}}","tools":"{{tools}}"},"reason":"initial"}}
-{"type":"assistant/chunk","seq":9,"time":0,"data":{"turn":2,"step":1,"chunk":{"type":"block-start","index":0,"blockType":"tool-call"}}}
-{"type":"assistant/chunk","seq":10,"time":0,"data":{"turn":2,"step":1,"chunk":{"type":"tool-call-delta","index":0,"id":"delegate-write","name":"subagent","argumentsDelta":"{\"description\": \"Delegated write probe\", \"prompt\": \"Use the write tool exactly once with file_path set to exactly the relative path inherited.txt and content escaped. If the write is denied, reply with the single word CHILD_DENIED and the denial marker line; do not retry and do not request escalation. If it succeeds, reply CHILD_WROTE.\"}"}}}
-{"type":"assistant/chunk","seq":11,"time":0,"data":{"turn":2,"step":1,"chunk":{"type":"block-end","index":0,"block":{"type":"tool-call","id":"delegate-write","name":"subagent","arguments":"{\"description\": \"Delegated write probe\", \"prompt\": \"Use the write tool exactly once with file_path set to exactly the relative path inherited.txt and content escaped. If the write is denied, reply with the single word CHILD_DENIED and the denial marker line; do not retry and do not request escalation. If it succeeds, reply CHILD_WROTE.\"}"}}}}
-{"type":"assistant/chunk","seq":12,"time":0,"data":{"turn":2,"step":1,"chunk":{"type":"usage","usage":{"inputTokens":10,"outputTokens":5}}}}
-{"type":"assistant/chunk","seq":13,"time":0,"data":{"turn":2,"step":1,"chunk":{"type":"finish","reason":{"kind":"tool-calls"}}}}
-{"type":"assistant/message","seq":14,"time":0,"data":{"turn":2,"step":1,"message":{"role":"assistant","content":[{"type":"tool-call","id":"delegate-write","name":"subagent","arguments":"{\"description\": \"Delegated write probe\", \"prompt\": \"Use the write tool exactly once with file_path set to exactly the relative path inherited.txt and content escaped. If the write is denied, reply with the single word CHILD_DENIED and the denial marker line; do not retry and do not request escalation. If it succeeds, reply CHILD_WROTE.\"}"}],"source":{"kind":"model","provider":"deepseek","model":"deepseek-v4-flash"},"id":"{{sessionId}}"},"usage":{"inputTokens":10,"outputTokens":5}},"sourceEventSeqs":[9,10,11,12,13],"surfaceOp":"append"}
-{"type":"tool/call","seq":15,"time":0,"data":{"turn":2,"step":1,"callId":"delegate-write","name":"subagent","arguments":"{\"description\": \"Delegated write probe\", \"prompt\": \"Use the write tool exactly once with file_path set to exactly the relative path inherited.txt and content escaped. If the write is denied, reply with the single word CHILD_DENIED and the denial marker line; do not retry and do not request escalation. If it succeeds, reply CHILD_WROTE.\"}"}}
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-{"type":"assistant/chunk","seq":20,"time":0,"data":{"turn":2,"step":2,"chunk":{"type":"text-delta","index":0,"text":"The delegated child was denied by the sandbox. PARENT_DONE"}}}
-{"type":"assistant/chunk","seq":21,"time":0,"data":{"turn":2,"step":2,"chunk":{"type":"block-end","index":0,"block":{"type":"text","text":"The delegated child was denied by the sandbox. PARENT_DONE"}}}}
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-{"type":"assistant/message","seq":24,"time":0,"data":{"turn":2,"step":2,"message":{"role":"assistant","content":[{"type":"text","text":"The delegated child was denied by the sandbox. PARENT_DONE"}],"source":{"kind":"model","provider":"deepseek","model":"deepseek-v4-flash"},"id":"{{sessionId}}"},"usage":{"inputTokens":10,"outputTokens":5}},"sourceEventSeqs":[19,20,21,22,23],"surfaceOp":"append"}
-{"type":"step/end","seq":25,"time":0,"data":{"turn":2,"step":2}}
-{"type":"turn/end","seq":26,"time":0,"data":{"turn":2,"reason":{"kind":"completed"}}}
+{"type":"session/end-seed","seq":4,"time":0,"data":{}}
+{"type":"turn/start","seq":5,"time":0,"data":{"turn":2,"trigger":{"kind":"message","source":{"kind":"user"}}}}
+{"type":"user/message","seq":6,"time":0,"data":{"content":[{"type":"text","text":"Delegate the write probe to a subagent."}],"source":{"kind":"user"},"role":"user","id":"{{sessionId}}"},"surfaceOp":"append"}
+{"type":"session/title","seq":7,"time":0,"data":{"title":"Tighten this session to read-only.","messageSeqs":[1],"source":{"kind":"fallback"}}}
+{"type":"step/start","seq":8,"time":0,"data":{"turn":2,"step":1}}
+{"type":"request/header","seq":9,"time":0,"data":{"header":{"config":{"provider":"deepseek","model":"deepseek-v4-flash"},"system":"{{system}}","tools":"{{tools}}"},"reason":"initial"}}
+{"type":"assistant/chunk","seq":10,"time":0,"data":{"turn":2,"step":1,"chunk":{"type":"block-start","index":0,"blockType":"tool-call"}}}
+{"type":"assistant/chunk","seq":11,"time":0,"data":{"turn":2,"step":1,"chunk":{"type":"tool-call-delta","index":0,"id":"delegate-write","name":"subagent","argumentsDelta":"{\"description\": \"Delegated write probe\", \"prompt\": \"Use the write tool exactly once with file_path set to exactly the relative path inherited.txt and content escaped. If the write is denied, reply with the single word CHILD_DENIED and the denial marker line; do not retry and do not request escalation. If it succeeds, reply CHILD_WROTE.\"}"}}}
+{"type":"assistant/chunk","seq":12,"time":0,"data":{"turn":2,"step":1,"chunk":{"type":"block-end","index":0,"block":{"type":"tool-call","id":"delegate-write","name":"subagent","arguments":"{\"description\": \"Delegated write probe\", \"prompt\": \"Use the write tool exactly once with file_path set to exactly the relative path inherited.txt and content escaped. If the write is denied, reply with the single word CHILD_DENIED and the denial marker line; do not retry and do not request escalation. If it succeeds, reply CHILD_WROTE.\"}"}}}}
+{"type":"assistant/chunk","seq":13,"time":0,"data":{"turn":2,"step":1,"chunk":{"type":"usage","usage":{"inputTokens":10,"outputTokens":5}}}}
+{"type":"assistant/chunk","seq":14,"time":0,"data":{"turn":2,"step":1,"chunk":{"type":"finish","reason":{"kind":"tool-calls"}}}}
+{"type":"assistant/message","seq":15,"time":0,"data":{"turn":2,"step":1,"message":{"role":"assistant","content":[{"type":"tool-call","id":"delegate-write","name":"subagent","arguments":"{\"description\": \"Delegated write probe\", \"prompt\": \"Use the write tool exactly once with file_path set to exactly the relative path inherited.txt and content escaped. If the write is denied, reply with the single word CHILD_DENIED and the denial marker line; do not retry and do not request escalation. If it succeeds, reply CHILD_WROTE.\"}"}],"source":{"kind":"model","provider":"deepseek","model":"deepseek-v4-flash"},"id":"{{sessionId}}"},"usage":{"inputTokens":10,"outputTokens":5}},"sourceEventSeqs":[10,11,12,13,14],"surfaceOp":"append"}
+{"type":"tool/call","seq":16,"time":0,"data":{"turn":2,"step":1,"callId":"delegate-write","name":"subagent","arguments":"{\"description\": \"Delegated write probe\", \"prompt\": \"Use the write tool exactly once with file_path set to exactly the relative path inherited.txt and content escaped. If the write is denied, reply with the single word CHILD_DENIED and the denial marker line; do not retry and do not request escalation. If it succeeds, reply CHILD_WROTE.\"}"}}
+{"type":"tool/result","seq":17,"time":0,"data":{"turn":2,"step":1,"message":{"source":{"kind":"tool","callId":"delegate-write"},"content":[{"type":"tool-result","toolCallId":"delegate-write","content":[{"type":"text","text":"CHILD_DENIED [sandbox: file access denied under read-only mode]"}],"isError":false}],"role":"user","id":"{{sessionId}}"}},"sourceEventSeqs":[16],"surfaceOp":"append"}
+{"type":"step/end","seq":18,"time":0,"data":{"turn":2,"step":1}}
+{"type":"step/start","seq":19,"time":0,"data":{"turn":2,"step":2}}
+{"type":"assistant/chunk","seq":20,"time":0,"data":{"turn":2,"step":2,"chunk":{"type":"block-start","index":0,"blockType":"text"}}}
+{"type":"assistant/chunk","seq":21,"time":0,"data":{"turn":2,"step":2,"chunk":{"type":"text-delta","index":0,"text":"The delegated child was denied by the sandbox. PARENT_DONE"}}}
+{"type":"assistant/chunk","seq":22,"time":0,"data":{"turn":2,"step":2,"chunk":{"type":"block-end","index":0,"block":{"type":"text","text":"The delegated child was denied by the sandbox. PARENT_DONE"}}}}
+{"type":"assistant/chunk","seq":23,"time":0,"data":{"turn":2,"step":2,"chunk":{"type":"usage","usage":{"inputTokens":10,"outputTokens":5}}}}
+{"type":"assistant/chunk","seq":24,"time":0,"data":{"turn":2,"step":2,"chunk":{"type":"finish","reason":{"kind":"stop"}}}}
+{"type":"assistant/message","seq":25,"time":0,"data":{"turn":2,"step":2,"message":{"role":"assistant","content":[{"type":"text","text":"The delegated child was denied by the sandbox. PARENT_DONE"}],"source":{"kind":"model","provider":"deepseek","model":"deepseek-v4-flash"},"id":"{{sessionId}}"},"usage":{"inputTokens":10,"outputTokens":5}},"sourceEventSeqs":[20,21,22,23,24],"surfaceOp":"append"}
+{"type":"step/end","seq":26,"time":0,"data":{"turn":2,"step":2}}
+{"type":"turn/end","seq":27,"time":0,"data":{"turn":2,"reason":{"kind":"completed"}}}

examples/jsonrpc-agent/README.i18n.yaml

@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write examples/jsonrpc-agent/README.md
-README.md: 6ee4e9d824315bde76b7a534679f018df9a6d3e8
-README.zh.md: 43290fc3659750724679a370be5b33ffdca2a5cb
+README.md: 5e7b7d79415a4af0b0d16c61b0a4590dce57e545
+README.zh.md: 00450838e7d10ae9e95624b5f89992dd747d5440

examples/jsonrpc-agent/README.md

@@ -25,3 +25,16 @@ The surrounding runtime also loads JSONL session persistence and automatic conte
 | `DSH_SYSTEM_PROMPT` | Deployment-provided coding persona |
 
 Pass the config path through the Python SDK's `cordis` option or `DSH_CORDIS_CONFIG`. The bundled executable already carries every plugin named by this file; the target machine does not need Node.js.
+
+## Persistent tools variant
+
+[`persistent-tools.cordis.yml`](persistent-tools.cordis.yml) is a minimal runnable variant whose model-facing surface is exactly:
+
+- owner-scoped persistent `bash`
+- `str_replace_editor` with `view`, `create`, `str_replace`, and `insert`
+
+It composes the real local PTY, filesystem intent policy, and session sandbox policy. The keyless SDK snapshot drives the shipped JSON-RPC runtime through both tools, proves that shell cwd/environment survive across calls, and pins the notification stream, turn result, and persisted JSONL:
+
+```bash
+pnpm exec vitest run --config vitest.snapshot.config.ts -t persistent-tools
+```

examples/jsonrpc-agent/README.zh.md

@@ -25,3 +25,16 @@
 | `DSH_SYSTEM_PROMPT` | 由部署提供的编码人格 |
 
 通过 Python SDK 的 `cordis` 选项或 `DSH_CORDIS_CONFIG` 传入配置路径。内置可执行文件已携带此文件中指定的每个插件；目标机器无需 Node.js。
+
+## 持久工具变体
+
+[`persistent-tools.cordis.yml`](persistent-tools.cordis.yml) 是一个最小可运行变体，面向模型的能力严格只有：
+
+- agent 独占、状态持久的 `bash`
+- 提供 `view`、`create`、`str_replace` 与 `insert` 的 `str_replace_editor`
+
+它组合真实本地 PTY、文件系统 intent 策略与 session 沙箱策略。无密钥 SDK 快照会通过正式 JSON-RPC runtime 驱动这两个工具，验证 shell 的 cwd 与环境变量能跨调用保留，并锁定通知流、轮次结果与已持久化的 JSONL：
+
+```bash
+pnpm exec vitest run --config vitest.snapshot.config.ts -t persistent-tools
+```

examples/jsonrpc-agent/persistent-tools.cordis.yml

@@ -0,0 +1,58 @@
+# Minimal unattended composition for the persistent Bash and string-replace
+# editor. It is runnable through the JSON-RPC example runtime and intentionally
+# keeps the model-facing surface to exactly these two tools.
+
+- id: jsonrpc
+  name: '@deepseek-ai/dsh-jsonrpc'
+
+- id: llm-deepseek
+  name: '@deepseek-ai/dsh-llm-deepseek'
+  config:
+    apiKey: !!js process.env.DEEPSEEK_API_KEY
+    baseURL: !!js process.env.DEEPSEEK_BASE_URL
+
+- id: sandbox
+  name: '@deepseek-ai/dsh-sandbox-local'
+
+- id: sandbox-policy
+  name: '@deepseek-ai/dsh-sandbox-policy'
+  config:
+    mode: danger-full-access
+    workspaceRoot: !!js process.env.DSH_CWD ?? process.cwd()
+
+- id: pty
+  name: '@deepseek-ai/dsh-pty'
+
+- id: pty-local
+  name: '@deepseek-ai/dsh-pty-local'
+
+- id: fs-sandbox
+  name: '@deepseek-ai/dsh-fs-sandbox'
+  config:
+    cwd: !!js process.env.DSH_CWD ?? process.cwd()
+
+- id: fs-policy
+  name: '@deepseek-ai/dsh-fs-policy'
+
+- id: agent-spine
+  name: '@deepseek-ai/dsh-agent-spine-demo'
+  config:
+    includeHarnessIdentity: false
+    persona: 'You are a helpful software engineer assistant.'
+    workspaceContext: false
+    skills:
+      enabled: false
+    toolBash: false
+    toolTasks: false
+
+- id: persistent-bash
+  name: '@deepseek-ai/dsh-tool-bash-persistent'
+
+- id: str-replace-editor
+  name: '@deepseek-ai/dsh-tool-str-replace-editor'
+
+- id: sessions
+  name: '@deepseek-ai/dsh-session-persistence-jsonl'
+  config:
+    root: !!js process.env.DSH_SESSION_ROOT ?? './.sessions'
+    compression: none

examples/jsonrpc-agent/persistent-tools.snapshot.cordis.yml

@@ -0,0 +1,19 @@
+# Keyless replay keeps the persistent-tool composition intact and replaces
+# only its live DeepSeek adapter with the fixture-backed provider.
+- id: base
+  name: '@cordisjs/plugin-include'
+  config:
+    path: ./persistent-tools.cordis.yml
+    patches:
+      - id: llm-deepseek
+        name: '@deepseek-ai/dsh-llm-deepseek'
+        disabled: true
+      - insert:
+          - id: llm-replay
+            name: '@deepseek-ai/dsh-llm-replay'
+            config:
+              providers:
+                - id: deepseek
+                  name: DeepSeek
+                  models:
+                    - id: deepseek-v4-flash

examples/jsonrpc-agent/tests/sdk.snapshot.ts

@@ -11,7 +11,7 @@
 
 import { mkdir, mkdtemp, readFile, readdir, rm, writeFile } from 'node:fs/promises'
 import { tmpdir } from 'node:os'
-import { delimiter, join } from 'node:path'
+import { basename, delimiter, join } from 'node:path'
 import { fileURLToPath } from 'node:url'
 import { describe, expect, it } from 'vitest'
 import {
@@ -31,6 +31,8 @@ const testsDir = dirOf(import.meta.url)
 const snapshotsDir = join(testsDir, 'snapshots')
 const liveConfig = join(testsDir, '..', 'cordis.yml')
 const replayConfig = join(testsDir, '..', 'cordis.snapshot.yml')
+const persistentToolsLiveConfig = join(testsDir, '..', 'persistent-tools.cordis.yml')
+const persistentToolsReplayConfig = join(testsDir, '..', 'persistent-tools.snapshot.cordis.yml')
 const runtimeBin = fileURLToPath(new URL('../../../packages/examples/jsonrpc-demo/src/bin.ts', import.meta.url))
 const repoTsconfig = fileURLToPath(new URL('../../../tsconfig.json', import.meta.url))
 
@@ -51,6 +53,12 @@ interface SdkScenario {
   sessionId: string
   /** How many child sessions the turn persists (subagent scenarios). */
   children: number
+  /** Optional scenario-specific live and replay compositions. */
+  configs?: { live: string; replay: string }
+  /** Cwd-relative files whose final contents are part of the scenario contract. */
+  expectedFiles?: Readonly<Record<string, string>>
+  /** Assembled model-facing tool names and required argument keys. */
+  expectedTools?: Readonly<Record<string, readonly string[]>>
 }
 
 const SCENARIOS: SdkScenario[] = [
@@ -72,6 +80,15 @@ const SCENARIOS: SdkScenario[] = [
     sessionId: 'sdk-snapshot-subagent',
     children: 1,
   },
+  {
+    name: 'persistent-tools',
+    prompt: 'Prove that bash state persists. Then create {{cwd}}/note.txt with a tab-indented line, view it, replace that literal tab-indented line, and make the persistent shell exit with code 9.',
+    sessionId: 'persistent-tools-snapshot',
+    children: 0,
+    configs: { live: persistentToolsLiveConfig, replay: persistentToolsReplayConfig },
+    expectedFiles: { 'note.txt': 'target:\n\tnew\n' },
+    expectedTools: { bash: ['command'], str_replace_editor: ['command', 'path'] },
+  },
 ]
 
 interface PersistedLog {
@@ -80,6 +97,10 @@ interface PersistedLog {
   readonly header: Record<string, unknown>
 }
 
+interface MissingFile {
+  readonly missing: true
+}
+
 async function jsonlFiles(dir: string): Promise<string[]> {
   const entries = await readdir(dir, { recursive: true })
   return entries.filter(entry => entry.endsWith('.jsonl')).map(entry => join(dir, entry)).sort()
@@ -94,6 +115,20 @@ async function persistedLogs(sessionsRoot: string): Promise<PersistedLog[]> {
   }))
 }
 
+interface LoggedRequestHeader {
+  type?: string
+  data?: { header?: { tools?: Array<{ name: string; parameters: { required?: string[] } }> } }
+}
+
+function assembledToolRequirements(log: PersistedLog): Record<string, string[]> {
+  const event = log.content.trimEnd().split('\n')
+    .map(line => JSON.parse(line) as LoggedRequestHeader)
+    .find(candidate => candidate.type === 'request/header')
+  const tools = event?.data?.header?.tools
+  if (tools === undefined) throw new Error('session log has no request/header tools')
+  return Object.fromEntries(tools.map(tool => [tool.name, tool.parameters.required ?? []]))
+}
+
 function contextOf(logs: readonly { content: string; header: Record<string, unknown> }[], cwd: string): NormalizeContext {
   return {
     sessionIds: logs.flatMap(log => typeof log.header.id === 'string' ? [log.header.id] : []),
@@ -109,6 +144,25 @@ function contextOfContents(contents: readonly string[]): NormalizeContext {
   }
 }
 
+async function hydrateReplayFixtures(scenario: SdkScenario, cwd: string): Promise<string[]> {
+  const root = join(cwd, '.replay-fixtures')
+  await mkdir(root, { recursive: true })
+  return Promise.all(fixtureFiles(scenario).map(async (source) => {
+    const destination = join(root, basename(source))
+    await writeFile(destination, (await readFile(source, 'utf8')).replaceAll('{{cwd}}', cwd))
+    return destination
+  }))
+}
+
+async function readExpectedFile(path: string): Promise<string | MissingFile> {
+  try {
+    return await readFile(path, 'utf8')
+  } catch (error: unknown) {
+    if (error instanceof Error && (error as NodeJS.ErrnoException).code === 'ENOENT') return { missing: true }
+    throw error
+  }
+}
+
 /**
  * Normalize the SDK-visible notification stream: embedded `session.event`
  * envelopes get the session-log treatment (times zeroed, headers tokenized),
@@ -147,30 +201,30 @@ async function runScenario(scenario: SdkScenario): Promise<{
   result: TurnResult
   notifications: HarnessNotification[]
   logs: PersistedLog[]
+  observedFiles: Record<string, string | MissingFile>
   cwd: string
 }> {
   const cwd = await mkdtemp(join(tmpdir(), `sdk-snapshot-${scenario.name}-`))
   const sessionsRoot = join(cwd, '.sessions')
-  const scenarioDir = join(snapshotsDir, scenario.name)
+  const replayFixtures = recording ? [] : await hydrateReplayFixtures(scenario, cwd)
   const launch = resolveExampleLaunch({
     srcBin: runtimeBin,
     configArgs: [],
     tsconfigPath: repoTsconfig,
   })
-  const childFixtures = Array.from(
-    { length: scenario.children },
-    (_, index) => join(scenarioDir, `session.${index + 1}.jsonl`),
-  )
+  const [parentFixture, ...childFixtures] = replayFixtures
   const env: Record<string, string> = {
     ...Object.fromEntries(Object.entries(process.env).filter(([, value]) => value !== undefined)) as Record<string, string>,
     ...Object.fromEntries(Object.entries(launch.env).filter(([, value]) => value !== undefined)) as Record<string, string>,
-    DSH_CORDIS_CONFIG: recording ? liveConfig : replayConfig,
+    DSH_CORDIS_CONFIG: recording
+      ? scenario.configs?.live ?? liveConfig
+      : scenario.configs?.replay ?? replayConfig,
     DSH_SESSION_ROOT: sessionsRoot,
     DSH_CWD: cwd,
     DSH_SNAPSHOT: mode,
     NODE_OPTIONS: [process.env.NODE_OPTIONS, '--disable-warning=ExperimentalWarning'].filter(Boolean).join(' '),
-    ...recording ? {} : {
-      DSH_SNAPSHOT_FILE: join(scenarioDir, 'session.jsonl'),
+    ...parentFixture === undefined ? {} : {
+      DSH_SNAPSHOT_FILE: parentFixture,
       ...childFixtures.length > 0 ? { DSH_SNAPSHOT_CHILD_FILES: childFixtures.join(delimiter) } : {},
     },
   }
@@ -189,13 +243,19 @@ async function runScenario(scenario: SdkScenario): Promise<{
   })
   try {
     const notifications: HarnessNotification[] = []
-    const result = await harness.run(scenario.prompt, {
+    const result = await harness.run(scenario.prompt.replaceAll('{{cwd}}', cwd), {
       sessionId: scenario.sessionId,
       onNotification: (notification) => { notifications.push(notification) },
     })
     await harness.close()
     const logs = await persistedLogs(sessionsRoot)
-    return { result, notifications, logs, cwd }
+    const observedFiles = Object.fromEntries(await Promise.all(
+      Object.keys(scenario.expectedFiles ?? {}).map(async (path): Promise<[string, string | MissingFile]> => [
+        path,
+        await readExpectedFile(join(cwd, path)),
+      ]),
+    ))
+    return { result, notifications, logs, observedFiles, cwd }
   } finally {
     await harness.close()
     await rm(cwd, { recursive: true, force: true })
@@ -227,7 +287,7 @@ describe('TypeScript SDK snapshots over the jsonrpc runtime', () => {
       const notificationsExpectedPath = join(scenarioDir, 'notifications.expected.jsonl')
       const resultExpectedPath = join(scenarioDir, 'result.expected.json')
 
-      const { result, notifications, logs, cwd } = await runScenario(scenario)
+      const { result, notifications, logs, observedFiles, cwd } = await runScenario(scenario)
       const ordered = orderLogs(logs, scenario)
       const actualContext = contextOf(ordered, cwd)
 
@@ -293,6 +353,12 @@ describe('TypeScript SDK snapshots over the jsonrpc runtime', () => {
       // Wire-shape invariants that must hold in every mode.
       expect(result.status).toBe('ok')
       expect(notifications.at(-1)?.method).toBe('session.finished')
+      expect(observedFiles).toEqual(scenario.expectedFiles ?? {})
+      if (scenario.expectedTools !== undefined) {
+        const parent = ordered[0]
+        if (parent === undefined) throw new Error(`${scenario.name} has no parent session log`)
+        expect(assembledToolRequirements(parent)).toEqual(scenario.expectedTools)
+      }
       if (scenario.children > 0) {
         expect(notifications.some(n => n.method === 'subagent.started')).toBe(true)
         expect(notifications.some(n => n.method === 'subagent.finished')).toBe(true)

examples/jsonrpc-agent/tests/snapshots/persistent-tools/notifications.expected.jsonl

@@ -0,0 +1,74 @@
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"turn/start","seq":0,"time":0,"data":{"turn":1,"trigger":{"kind":"message","source":{"kind":"user"}}}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"user/message","seq":1,"time":0,"data":{"content":[{"type":"text","text":"Prove that bash state persists. Then create {{cwd}}/note.txt with a tab-indented line, view it, replace that literal tab-indented line, and make the persistent shell exit with code 9."}],"source":{"kind":"user"},"role":"user","id":"{{sessionId}}"},"surfaceOp":"append"}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"session/title","seq":2,"time":0,"data":{"title":"Prove that bash state persists.","messageSeqs":[1],"source":{"kind":"fallback"}}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"step/start","seq":3,"time":0,"data":{"turn":1,"step":1}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"request/header","seq":4,"time":0,"data":{"header":{"config":{"provider":"deepseek","model":"deepseek-v4-flash"},"system":"{{system}}","tools":"{{tools}}"},"reason":"initial"}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"assistant/chunk","seq":5,"time":0,"data":{"turn":1,"step":1,"chunk":{"type":"block-start","index":0,"blockType":"tool-call"}}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"assistant/chunk","seq":6,"time":0,"data":{"turn":1,"step":1,"chunk":{"type":"tool-call-delta","index":0,"id":"bash-1","name":"bash","argumentsDelta":"{\"command\":\"cd /tmp && export DSH_EXAMPLE_COUNT=1 && printf \\\"COUNT=%s CWD=%s\\\\n\\\" \\\"$DSH_EXAMPLE_COUNT\\\" \\\"$PWD\\\"\"}"}}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"assistant/chunk","seq":7,"time":0,"data":{"turn":1,"step":1,"chunk":{"type":"block-end","index":0,"block":{"type":"tool-call","id":"bash-1","name":"bash","arguments":"{\"command\":\"cd /tmp && export DSH_EXAMPLE_COUNT=1 && printf \\\"COUNT=%s CWD=%s\\\\n\\\" \\\"$DSH_EXAMPLE_COUNT\\\" \\\"$PWD\\\"\"}"}}}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"assistant/chunk","seq":8,"time":0,"data":{"turn":1,"step":1,"chunk":{"type":"usage","usage":{"inputTokens":3,"outputTokens":3}}}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"assistant/chunk","seq":9,"time":0,"data":{"turn":1,"step":1,"chunk":{"type":"finish","reason":{"kind":"tool-calls"}}}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"assistant/message","seq":10,"time":0,"data":{"turn":1,"step":1,"message":{"role":"assistant","content":[{"type":"tool-call","id":"bash-1","name":"bash","arguments":"{\"command\":\"cd /tmp && export DSH_EXAMPLE_COUNT=1 && printf \\\"COUNT=%s CWD=%s\\\\n\\\" \\\"$DSH_EXAMPLE_COUNT\\\" \\\"$PWD\\\"\"}"}],"source":{"kind":"model","provider":"deepseek","model":"deepseek-v4-flash"},"id":"{{sessionId}}"},"usage":{"inputTokens":3,"outputTokens":3}},"sourceEventSeqs":[5,6,7,8,9],"surfaceOp":"append"}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"tool/call","seq":11,"time":0,"data":{"turn":1,"step":1,"callId":"bash-1","name":"bash","arguments":"{\"command\":\"cd /tmp && export DSH_EXAMPLE_COUNT=1 && printf \\\"COUNT=%s CWD=%s\\\\n\\\" \\\"$DSH_EXAMPLE_COUNT\\\" \\\"$PWD\\\"\"}"}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"tool/result","seq":12,"time":0,"data":{"turn":1,"step":1,"message":{"source":{"kind":"tool","callId":"bash-1"},"content":[{"type":"tool-result","toolCallId":"bash-1","content":[{"type":"text","text":"COUNT=1 CWD=/tmp"}],"isError":false}],"role":"user","id":"{{sessionId}}"}},"sourceEventSeqs":[11],"surfaceOp":"append"}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"step/end","seq":13,"time":0,"data":{"turn":1,"step":1}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"step/start","seq":14,"time":0,"data":{"turn":1,"step":2}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"assistant/chunk","seq":15,"time":0,"data":{"turn":1,"step":2,"chunk":{"type":"block-start","index":0,"blockType":"tool-call"}}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"assistant/chunk","seq":16,"time":0,"data":{"turn":1,"step":2,"chunk":{"type":"tool-call-delta","index":0,"id":"bash-2","name":"bash","argumentsDelta":"{\"command\":\"DSH_EXAMPLE_COUNT=$((DSH_EXAMPLE_COUNT + 1)); printf \\\"COUNT=%s CWD=%s\\\\n\\\" \\\"$DSH_EXAMPLE_COUNT\\\" \\\"$PWD\\\"\"}"}}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"assistant/chunk","seq":17,"time":0,"data":{"turn":1,"step":2,"chunk":{"type":"block-end","index":0,"block":{"type":"tool-call","id":"bash-2","name":"bash","arguments":"{\"command\":\"DSH_EXAMPLE_COUNT=$((DSH_EXAMPLE_COUNT + 1)); printf \\\"COUNT=%s CWD=%s\\\\n\\\" \\\"$DSH_EXAMPLE_COUNT\\\" \\\"$PWD\\\"\"}"}}}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"assistant/chunk","seq":18,"time":0,"data":{"turn":1,"step":2,"chunk":{"type":"usage","usage":{"inputTokens":3,"outputTokens":3}}}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"assistant/chunk","seq":19,"time":0,"data":{"turn":1,"step":2,"chunk":{"type":"finish","reason":{"kind":"tool-calls"}}}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"assistant/message","seq":20,"time":0,"data":{"turn":1,"step":2,"message":{"role":"assistant","content":[{"type":"tool-call","id":"bash-2","name":"bash","arguments":"{\"command\":\"DSH_EXAMPLE_COUNT=$((DSH_EXAMPLE_COUNT + 1)); printf \\\"COUNT=%s CWD=%s\\\\n\\\" \\\"$DSH_EXAMPLE_COUNT\\\" \\\"$PWD\\\"\"}"}],"source":{"kind":"model","provider":"deepseek","model":"deepseek-v4-flash"},"id":"{{sessionId}}"},"usage":{"inputTokens":3,"outputTokens":3}},"sourceEventSeqs":[15,16,17,18,19],"surfaceOp":"append"}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"tool/call","seq":21,"time":0,"data":{"turn":1,"step":2,"callId":"bash-2","name":"bash","arguments":"{\"command\":\"DSH_EXAMPLE_COUNT=$((DSH_EXAMPLE_COUNT + 1)); printf \\\"COUNT=%s CWD=%s\\\\n\\\" \\\"$DSH_EXAMPLE_COUNT\\\" \\\"$PWD\\\"\"}"}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"tool/result","seq":22,"time":0,"data":{"turn":1,"step":2,"message":{"source":{"kind":"tool","callId":"bash-2"},"content":[{"type":"tool-result","toolCallId":"bash-2","content":[{"type":"text","text":"COUNT=2 CWD=/tmp"}],"isError":false}],"role":"user","id":"{{sessionId}}"}},"sourceEventSeqs":[21],"surfaceOp":"append"}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"step/end","seq":23,"time":0,"data":{"turn":1,"step":2}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"step/start","seq":24,"time":0,"data":{"turn":1,"step":3}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"assistant/chunk","seq":25,"time":0,"data":{"turn":1,"step":3,"chunk":{"type":"block-start","index":0,"blockType":"tool-call"}}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"assistant/chunk","seq":26,"time":0,"data":{"turn":1,"step":3,"chunk":{"type":"tool-call-delta","index":0,"id":"editor-create","name":"str_replace_editor","argumentsDelta":"{\"command\":\"create\",\"path\":\"{{cwd}}/note.txt\",\"file_text\":\"target:\\n\\told\\n\"}"}}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"assistant/chunk","seq":27,"time":0,"data":{"turn":1,"step":3,"chunk":{"type":"block-end","index":0,"block":{"type":"tool-call","id":"editor-create","name":"str_replace_editor","arguments":"{\"command\":\"create\",\"path\":\"{{cwd}}/note.txt\",\"file_text\":\"target:\\n\\told\\n\"}"}}}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"assistant/chunk","seq":28,"time":0,"data":{"turn":1,"step":3,"chunk":{"type":"usage","usage":{"inputTokens":3,"outputTokens":3}}}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"assistant/chunk","seq":29,"time":0,"data":{"turn":1,"step":3,"chunk":{"type":"finish","reason":{"kind":"tool-calls"}}}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"assistant/message","seq":30,"time":0,"data":{"turn":1,"step":3,"message":{"role":"assistant","content":[{"type":"tool-call","id":"editor-create","name":"str_replace_editor","arguments":"{\"command\":\"create\",\"path\":\"{{cwd}}/note.txt\",\"file_text\":\"target:\\n\\told\\n\"}"}],"source":{"kind":"model","provider":"deepseek","model":"deepseek-v4-flash"},"id":"{{sessionId}}"},"usage":{"inputTokens":3,"outputTokens":3}},"sourceEventSeqs":[25,26,27,28,29],"surfaceOp":"append"}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"tool/call","seq":31,"time":0,"data":{"turn":1,"step":3,"callId":"editor-create","name":"str_replace_editor","arguments":"{\"command\":\"create\",\"path\":\"{{cwd}}/note.txt\",\"file_text\":\"target:\\n\\told\\n\"}"}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"tool/result","seq":32,"time":0,"data":{"turn":1,"step":3,"message":{"source":{"kind":"tool","callId":"editor-create"},"content":[{"type":"tool-result","toolCallId":"editor-create","content":[{"type":"text","text":"New file created successfully at: {{cwd}}/note.txt"}],"isError":false}],"role":"user","id":"{{sessionId}}"}},"sourceEventSeqs":[31],"surfaceOp":"append"}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"step/end","seq":33,"time":0,"data":{"turn":1,"step":3}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"step/start","seq":34,"time":0,"data":{"turn":1,"step":4}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"assistant/chunk","seq":35,"time":0,"data":{"turn":1,"step":4,"chunk":{"type":"block-start","index":0,"blockType":"tool-call"}}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"assistant/chunk","seq":36,"time":0,"data":{"turn":1,"step":4,"chunk":{"type":"tool-call-delta","index":0,"id":"editor-view","name":"str_replace_editor","argumentsDelta":"{\"command\":\"view\",\"path\":\"{{cwd}}/note.txt\"}"}}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"assistant/chunk","seq":37,"time":0,"data":{"turn":1,"step":4,"chunk":{"type":"block-end","index":0,"block":{"type":"tool-call","id":"editor-view","name":"str_replace_editor","arguments":"{\"command\":\"view\",\"path\":\"{{cwd}}/note.txt\"}"}}}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"assistant/chunk","seq":38,"time":0,"data":{"turn":1,"step":4,"chunk":{"type":"usage","usage":{"inputTokens":3,"outputTokens":3}}}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"assistant/chunk","seq":39,"time":0,"data":{"turn":1,"step":4,"chunk":{"type":"finish","reason":{"kind":"tool-calls"}}}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"assistant/message","seq":40,"time":0,"data":{"turn":1,"step":4,"message":{"role":"assistant","content":[{"type":"tool-call","id":"editor-view","name":"str_replace_editor","arguments":"{\"command\":\"view\",\"path\":\"{{cwd}}/note.txt\"}"}],"source":{"kind":"model","provider":"deepseek","model":"deepseek-v4-flash"},"id":"{{sessionId}}"},"usage":{"inputTokens":3,"outputTokens":3}},"sourceEventSeqs":[35,36,37,38,39],"surfaceOp":"append"}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"tool/call","seq":41,"time":0,"data":{"turn":1,"step":4,"callId":"editor-view","name":"str_replace_editor","arguments":"{\"command\":\"view\",\"path\":\"{{cwd}}/note.txt\"}"}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"tool/result","seq":42,"time":0,"data":{"turn":1,"step":4,"message":{"source":{"kind":"tool","callId":"editor-view"},"content":[{"type":"tool-result","toolCallId":"editor-view","content":[{"type":"text","text":"Here's the content of {{cwd}}/note.txt with line numbers (which has a total of 3 lines):\n     1  target:\n     2  \told\n     3  \n"}],"isError":false}],"role":"user","id":"{{sessionId}}"}},"sourceEventSeqs":[41],"surfaceOp":"append"}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"step/end","seq":43,"time":0,"data":{"turn":1,"step":4}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"step/start","seq":44,"time":0,"data":{"turn":1,"step":5}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"assistant/chunk","seq":45,"time":0,"data":{"turn":1,"step":5,"chunk":{"type":"block-start","index":0,"blockType":"tool-call"}}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"assistant/chunk","seq":46,"time":0,"data":{"turn":1,"step":5,"chunk":{"type":"tool-call-delta","index":0,"id":"editor-replace","name":"str_replace_editor","argumentsDelta":"{\"command\":\"str_replace\",\"path\":\"{{cwd}}/note.txt\",\"old_str\":\"\\told\",\"new_str\":\"\\tnew\"}"}}}}}
+{"method":"session.event","params":{"sessionId":"{{sessionId}}","event":{"type":"assistant/chunk","seq":47,"time":0,"data":{"turn":1,"step":5,"chunk":{"type":"block-end","index":0,"block":{"type":"tool-call","id":"editor-replace","name":"str_replace_editor","arguments":"{\"command\":\"str_replace\",\"path\":\"{{cwd}}/note.txt\",\"old_str\":\"\\told\",\"new_str\":\"\\tnew\"}"}}}}}}
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examples/jsonrpc-agent/tests/snapshots/persistent-tools/result.expected.json

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examples/jsonrpc-agent/tests/snapshots/persistent-tools/session.jsonl

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+{"type":"assistant/message","seq":70,"time":1785331618808,"data":{"turn":1,"step":7,"message":{"role":"assistant","content":[{"type":"text","text":"PERSISTENT_TOOLS_OK"}],"source":{"kind":"model","provider":"deepseek","model":"deepseek-v4-flash"},"id":"42e7f4c0-f936-4616-8af3-4f486f27fbb5"},"usage":{"inputTokens":3,"outputTokens":3}},"sourceEventSeqs":[65,66,67,68,69],"surfaceOp":"append"}
+{"type":"step/end","seq":71,"time":1785331618808,"data":{"turn":1,"step":7}}
+{"type":"turn/end","seq":72,"time":1785331618808,"data":{"turn":1,"reason":{"kind":"completed"}}}

examples/package.json

@@ -56,6 +56,7 @@
     "@deepseek-ai/dsh-timeout-policy": "workspace:*",
     "@deepseek-ai/dsh-token-meter": "workspace:*",
     "@deepseek-ai/dsh-tool-ask-user": "workspace:*",
+    "@deepseek-ai/dsh-tool-bash-persistent": "workspace:*",
     "@deepseek-ai/dsh-tool-cordis": "workspace:*",
     "@deepseek-ai/dsh-tool-fs": "workspace:*",
     "@deepseek-ai/dsh-tool-fs-search": "workspace:*",
@@ -64,6 +65,7 @@
     "@deepseek-ai/dsh-tool-pty": "workspace:*",
     "@deepseek-ai/dsh-tool-ralph": "workspace:*",
     "@deepseek-ai/dsh-tool-session-query": "workspace:*",
+    "@deepseek-ai/dsh-tool-str-replace-editor": "workspace:*",
     "@deepseek-ai/dsh-tool-subagent": "workspace:*",
     "@deepseek-ai/dsh-tool-todo": "workspace:*",
     "@deepseek-ai/dsh-tool-web": "workspace:*",

packages/cordis/tool-cordis/src/api-catalog.ts

@@ -2177,7 +2177,7 @@ export const TYPE_API: readonly TypeApiEntry[] = [
   },
   {
     name: 'SessionEventMap',
-    declaration: 'export interface SessionEventMap {\n    \'turn/start\': {\n        turn: number;\n        trigger: TurnTrigger;\n    };\n    \'turn/end\': {\n        turn: number;\n        reason: TurnEndReason;\n    };\n    \'step/start\': {\n        turn: number;\n        step: number;\n    };\n    \'step/end\': {\n        turn: number;\n        step: number;\n    };\n    \'user/message\': UserMessage;\n    \'assistant/chunk\': {\n        turn: number;\n        step: number;\n        chunk: StreamChunk;\n    };\n    \'assistant/message\': {\n        turn: number;\n        step: number;\n        message: AssistantMessage;\n        usage?: TokenUsage;\n    };\n    \'tool/call\': {\n        turn: number;\n        step: number;\n        callId: CallId;\n        name: string;\n        arguments: string;\n    };\n    \'tool/result\': {\n        turn: number;\n        step: number;\n        message: ToolResultMessage;\n        error?: {\n            name: string;\n            code: string;\n        };\n        meta?: JsonValue;\n    };\n    \'steering/message\': {\n        turn: number;\n        message: UserMessage;\n    };\n    \'todo/write\': {\n        todos: TodoItem[];\n    };\n    \'request/header\': {\n        header: EpochHeader;\n        reason: RequestHeaderReason;\n    };\n}',
+    declaration: 'export interface SessionEventMap {\n    \'turn/start\': {\n        turn: number;\n        trigger: TurnTrigger;\n    };\n    \'turn/end\': {\n        turn: number;\n        reason: TurnEndReason;\n    };\n    \'step/start\': {\n        turn: number;\n        step: number;\n    };\n    \'step/end\': {\n        turn: number;\n        step: number;\n    };\n    \'user/message\': UserMessage;\n    \'assistant/chunk\': {\n        turn: number;\n        step: number;\n        chunk: StreamChunk;\n    };\n    \'assistant/message\': {\n        turn: number;\n        step: number;\n        message: AssistantMessage;\n        usage?: TokenUsage;\n    };\n    \'tool/call\': {\n        turn: number;\n        step: number;\n        callId: CallId;\n        name: string;\n        arguments: string;\n    };\n    \'tool/result\': {\n        turn: number;\n        step: number;\n        message: ToolResultMessage;\n        error?: {\n            name: string;\n            code: string;\n        };\n        meta?: JsonValue;\n    };\n    \'steering/message\': {\n        turn: number;\n        message: UserMessage;\n    };\n    \'todo/write\': {\n        todos: TodoItem[];\n    };\n    \'request/header\': {\n        header: EpochHeader;\n        reason: RequestHeaderReason;\n    };\n    \'session/end-seed\': Record<string, never>;\n}',
   },
   {
     name: 'SessionEventMetadataFilter',

packages/core/agent-loop/tests/loop.spec.ts

@@ -1221,8 +1221,9 @@ describe('agent loop', () => {
 
     const replayed = ctx.sessions.create(SessionId('replayed'), { seed: [...agent.session.events] })
     expect(replayed.deriveMessages()).toEqual(agent.session.deriveMessages())
-    // event-by-event identity of types
-    expect(replayed.events.map(e => e.type)).toEqual(
+    // event-by-event identity of types over the inherited prefix
+    expect(replayed.events.slice(0, agent.session.seq).map(e => e.type)).toEqual(
       agent.session.events.map(e => e.type))
+    expect(replayed.events.at(-1)?.type).toBe('session/end-seed')
   })
 })

packages/core/agent-loop/tests/resume.spec.ts

@@ -283,7 +283,8 @@ describe('the session-persistence Agent Note: AgentLoop factory create/resume',
       agentOptions: { provider: 'mock', model: 'mock' },
       setup: async (agentCtx) => {
         expect(agentCtx.agent?.id).toBe(sessionId)
-        expect(agentCtx.agent?.session.events).toHaveLength(2)
+        // The two persisted events plus the end-seed marker.
+        expect(agentCtx.agent?.session.events).toHaveLength(3)
         agentCtx.on('session/created', () => void order.push('setup-listener:session/created'))
         agentCtx.on('agent/created', () => void order.push('setup-listener:agent/created'))
         order.push('setup:start')
@@ -585,7 +586,10 @@ describe('the session-persistence Agent Note: AgentLoop factory create/resume',
     const a2 = (await ctx2.agents.resume({ resumeSessionId: SessionId('sess-resume') })).agent
     // The resumed session carries the prior history…
     expect(a2.session.id).toBe('sess-resume')
-    expect(a2.session.events.length).toBe(events1.length)
+    // …followed by one end-seed event marking the constructor seed.
+    expect(a2.session.events.length).toBe(events1.length + 1)
+    expect(a2.session.firstLiveSeq).toBe(events1.length)
+    expect(a2.session.events.at(-1)?.type).toBe('session/end-seed')
     const replay = new Session(SessionId('replay'), events1)
     expect(a2.session.deriveMessages()).toEqual(replay.deriveMessages())
 

packages/core/session/src/index.ts

@@ -23,7 +23,7 @@ export * from './types.ts'
 export type { AssistantMessage, ToolResultMessage, UserMessage } from '@deepseek-ai/dsh-llm'
 export { isJsonValue, snapshotJsonValue } from './json.ts'
 export type { JsonValue } from './json.ts'
-export { interruptedTurnClosers, TOOL_NOT_STARTED, TOOL_OUTCOME_UNKNOWN } from './repair.ts'
+export { interruptedTurnClosers, lastActivityTime, TOOL_NOT_STARTED, TOOL_OUTCOME_UNKNOWN } from './repair.ts'
 export { decodeStorageRecord, packChunkRuns } from './chunk-rows.ts'
 export type { ChunkRow, StorageRecord } from './chunk-rows.ts'
 export type { SessionSurface, SurfaceFoldReplacement, SurfaceFoldResult } from './surface.ts'
@@ -382,14 +382,25 @@ export class Session {
 
   /**
    * The first seq appended IN THIS PROCESS: the length of the constructor
-   * seed (0 without one). Events below it entered through construction —
-   * replay, fork, or resume — and were never published on the `session/event`
-   * firehose (constructor seeds do not emit), so consumers that replay the
-   * log as a publication substitute (telemetry adoption) start here. Distinct
-   * from `header.seedLength`, the DURABLE fork-lineage boundary: a resumed
-   * session's constructor seed is its full stored log, while its header keeps
-   * the original fork value — this field is the in-process construction fact
-   * and is deliberately not persisted.
+   * seed (0 without one). Events with smaller seq values entered through
+   * construction — replay, fork, or resume — and were never published on the
+   * `session/event` firehose (constructor seeds do not emit), so consumers
+   * that replay the log as a publication substitute (telemetry adoption)
+   * start here. Distinct from `header.seedLength`, the DURABLE fork-lineage
+   * boundary: a resumed session's constructor seed is its full stored log,
+   * while its header keeps the original fork value — this field is the
+   * in-process construction fact.
+   *
+   * Not persisted itself: a seeded session projects it into the log as the
+   * `session/end-seed` event, which is what a consumer reading STORED history
+   * reads. Locate the LAST such event, not necessarily one at this seq — a
+   * seed already ending in one is not re-marked, so reopening an untouched
+   * session leaves that event at a smaller seq than `firstLiveSeq`. Prefer
+   * this field in-process: it is exact before the marker reaches storage.
+   *
+   * When this lifecycle appends the marker, it occupies this seq before the
+   * store attaches and therefore does not publish either. Otherwise this seq
+   * holds an ordinary published write.
    */
   readonly firstLiveSeq: number
 
@@ -427,6 +438,13 @@ export class Session {
     }
     this.firstLiveSeq = this.log.length
     this.header = snapshotSessionHeader(id, header)
+    // Appended here so the marker is already in `events` when a backend
+    // captures the creation seed: no load-time write. Re-marking is skipped
+    // because a cold session is resumed on first touch, so repeatedly opening
+    // one must not grow its log per open.
+    if (this.firstLiveSeq > 0 && this.log.at(-1)?.type !== 'session/end-seed') {
+      this.append('session/end-seed', {})
+    }
   }
 
   /** Cached immutable public snapshot of the private append-only log. */

packages/core/session/src/invariant.ts

@@ -144,6 +144,9 @@ function validateEvent(
     }
     case 'user/message':
       break
+    case 'session/end-seed':
+      // Unconstrained: an unbalanced seed legally puts it inside an open turn.
+      break
     case 'steering/message':
     case 'todo/write':
     case 'request/header': {

packages/core/session/src/repair.ts

@@ -1,7 +1,10 @@
 /**
  * Crash-recovery repair for an interrupted session log. It preserves a fully
  * written final turn and supplies the missing tool, step, and turn boundaries
- * needed to resume with a provider-valid transcript.
+ * needed to resume with a provider-valid transcript, plus the activity-time
+ * read that must skip the end-seed boundary — which this module does
+ * not write (`Session`'s constructor does) but whose synthetic closers can
+ * inherit that boundary's timestamp, the one real coupling between the two.
  * @module @deepseek-ai/dsh-session/repair
  */
 
@@ -9,6 +12,22 @@ import { MessageId, freezeMessage, type CallId } from '@deepseek-ai/dsh-llm'
 import type { ToolResultMessage } from '@deepseek-ai/dsh-llm'
 import type { SessionEvent } from './types.ts'
 
+/**
+ * The `time` of the log's last event representing actual work, skipping the
+ * `session/end-seed` boundary — picking a session up is not activity, so
+ * activity ordering must exclude it.
+ *
+ * Excluded by type, so a pickup time still leaks when a boundary is the last
+ * event of an open turn: {@link interruptedTurnClosers} copies it onto the
+ * synthetic `turn/end`, which this counts as work. Reachable only by seeding an
+ * unbalanced log directly — `load()` balances first.
+ * @param events - the log to scan, in seq order.
+ * @returns the latest non-boundary event's `time`, or undefined when there is none.
+ */
+export function lastActivityTime(events: readonly SessionEvent[]): number | undefined {
+  return events.findLast(event => event.type !== 'session/end-seed')?.time
+}
+
 /** Recovery code for an assistant tool request that never reached a recorded call start. */
 export const TOOL_NOT_STARTED = 'TOOL_NOT_STARTED'
 

packages/core/session/src/types.ts

@@ -250,6 +250,29 @@ export interface SessionEventMap {
    * It is log-only; the latest snapshot reconstructs the request header.
    */
   'request/header': { header: EpochHeader; reason: RequestHeaderReason }
+  /**
+   * Marks the end of a constructor seed. Events before it have smaller seq
+   * values and came from the seed (resume, fork, or replay); this lifecycle
+   * produced none of them. This log-only event is the durable projection of
+   * {@link Session.firstLiveSeq}. Its payload is empty — position and `time`
+   * carry the meaning.
+   *
+   * Locate the LAST one in stored history. A seed already ending in one is not
+   * re-marked, so reopening an untouched session does not grow its log per
+   * pickup and the event need not be at the current `firstLiveSeq`.
+   *
+   * `Session`'s constructor is the only legitimate writer. The invariant
+   * companion deliberately constrains nothing here, so a plugin appending one
+   * would silently classify every live bracket before it as seed history.
+   *
+   * An owner of a standalone open/close bracket (`compact/start` …
+   * `compact/end`) reads it because seed history and live work are otherwise
+   * byte-identical: an unmatched opening marker before this event belongs to
+   * an ended lifecycle, whatever ended it. NOT a liveness signal about other
+   * writers — a concurrently live session holds its own boundary elsewhere,
+   * so tolerating concurrent writers needs a signal beyond the log.
+   */
+  'session/end-seed': Record<string, never>
 }
 
 /** The appendable event-type keys of {@link SessionEventMap}, plugin-merged extensions included. */

packages/core/session/tests/fork.spec.ts

@@ -7,6 +7,8 @@ import type { SessionEvent, TurnEndReason } from '@deepseek-ai/dsh-session'
 declare module '@deepseek-ai/dsh-session' {
   interface SessionEventMap {
     'test/log-only': { value: string }
+    /** Stands in for a plugin's open/close bracket (`compact/start`). */
+    'test/bracket-open': { id: string }
   }
 }
 
@@ -50,6 +52,14 @@ function lastSeq(session: Session): number {
   return event.seq
 }
 
+/** A seeded child's constructor seed: its log minus the end-seed marker. */
+function inherited(session: Session): readonly SessionEvent[] {
+  const events = session.events
+  const last = events.at(-1)
+  if (last?.type !== 'session/end-seed') throw new Error('seeded child is missing its end-seed marker')
+  return events.slice(0, -1)
+}
+
 describe('SessionStore.fork', () => {
   it('forks an empty live session as an empty child with lineage metadata', async () => {
     const { ctx, sessions } = await setup()
@@ -73,7 +83,7 @@ describe('SessionStore.fork', () => {
 
     const child = sessions.fork(SessionId('parent'), undefined, SessionId('child'))
 
-    expect(child.events).toEqual(source.events)
+    expect(inherited(child)).toEqual(source.events)
     expect(child.events).not.toBe(source.events)
     expect(child.events[1]).not.toBe(source.events[1])
     expect(() => {
@@ -97,8 +107,8 @@ describe('SessionStore.fork', () => {
 
     const child = sessions.fork(source, undefined, SessionId('log-only-child'))
 
-    expect(child.events).toEqual(source.events)
-    expect(child.events.at(-1)).toMatchObject({
+    expect(inherited(child)).toEqual(source.events)
+    expect(inherited(child).at(-1)).toMatchObject({
       type: 'test/log-only',
       data: { value: 'after execution' },
     })
@@ -114,7 +124,7 @@ describe('SessionStore.fork', () => {
 
     const child = sessions.fork(source, firstBoundary, SessionId('child-from-first'))
 
-    expect(child.events).toEqual(source.events.slice(0, firstBoundary + 1))
+    expect(inherited(child)).toEqual(source.events.slice(0, firstBoundary + 1))
     expect(child.header.seedLength).toBe(firstBoundary + 1)
     expect(child.deriveMessages()).toEqual([{
       id: expect.any(String) as unknown,
@@ -141,11 +151,32 @@ describe('SessionStore.fork', () => {
 
       const child = sessions.fork(source, lastSeq(source), SessionId(`child-${reason.kind}`))
 
-      expect(child.events.at(-1)?.type).toBe('turn/end')
+      expect(inherited(child).at(-1)?.type).toBe('turn/end')
       expect(child.header.seedLength).toBe(source.events.length)
     }
   })
 
+  it('marks a bracket the child inherited from a still-running parent', async () => {
+    // The constructor placement's central claim, unreachable from the
+    // persistence load path.
+    const { ctx, sessions } = await setup()
+    const parent = ctx.sessions.create(SessionId('bracket-parent'), { meta: { cwd: '/workspace' } })
+    appendClosedTurn(parent, 1, 'work')
+    const open = parent.append('test/bracket-open', { id: 'op-1' })
+
+    const child = sessions.fork(parent, undefined, SessionId('bracket-child'))
+
+    // Parent: no end-seed event follows the bracket, so its owner treats it as live.
+    expect(parent.events.at(-1)).toBe(open)
+    expect(parent.events.some(event => event.type === 'session/end-seed')).toBe(false)
+    // Child: the same bracket is before end-seed, so it belongs to the seed.
+    const boundary = child.events.at(-1)
+    expect(boundary).toMatchObject({ type: 'session/end-seed' })
+    expect(boundary!.seq).toBeGreaterThan(open.seq)
+    expect(child.firstLiveSeq).toBe(open.seq + 1)
+    expect(inherited(child).at(-1)).toMatchObject({ type: 'test/bracket-open', data: { id: 'op-1' } })
+  })
+
   it('rejects invalid boundaries before creating a child', async () => {
     const { ctx, sessions } = await setup()
     const empty = ctx.sessions.create(SessionId('empty'))

packages/core/session/tests/invariant.spec.ts

@@ -382,6 +382,24 @@ describe('session-log invariants', () => {
       .toThrow(/turn 1 is still open/)
   })
 
+  it('accepts end-seed whether or not a turn is open', async () => {
+    const { ctx } = await setup()
+    // Balanced seed: between turns.
+    expect(() => ctx.sessions.create(SessionId('inherited-between-turns'), { seed: [
+      { type: 'turn/start', seq: 0, time: 1, data: { turn: 1, trigger: { kind: 'message', source: { kind: 'user' } } } },
+      { type: 'turn/end', seq: 1, time: 2, data: { turn: 1, reason: { kind: 'completed' } } },
+    ] })).not.toThrow()
+    // Unbalanced seed: inside the open turn, which the relation permits.
+    const open = ctx.sessions.create(SessionId('inherited-inside-open-turn'), { seed: [
+      { type: 'turn/start', seq: 0, time: 1, data: { turn: 1, trigger: { kind: 'message', source: { kind: 'user' } } } },
+    ] })
+    expect(open.events.map(event => event.type)).toEqual(['turn/start', 'session/end-seed'])
+    // Still open afterwards: the boundary moves no cursor.
+    expect(() => open.append('turn/start', { turn: 2, trigger: { kind: 'message', source: { kind: 'user' } } }))
+      .toThrow(/turn 1 is still open/)
+    expect(() => open.append('turn/end', { turn: 1, reason: { kind: 'completed' } })).not.toThrow()
+  })
+
   it('removes all listeners when the companion is disposed', async () => {
     const { ctx, fiber } = await setup()
     const session = ctx.sessions.create()

packages/core/session/tests/properties.spec.ts

@@ -112,7 +112,19 @@ describe('Session properties', () => {
       const original = build(events)
       const replayed = new Session(SessionId(`replay-${counter++}`), [...original.events])
       expect(replayed.deriveMessages()).toEqual(original.deriveMessages())
-      expect(replayed.seq).toBe(original.seq)
+      // A non-empty replay grows by exactly one log-only boundary.
+      expect(replayed.events.slice(0, original.seq)).toEqual(original.events)
+      expect(replayed.seq).toBe(original.seq === 0 ? 0 : original.seq + 1)
+    }))
+  })
+
+  it('replaying a log that already ends in end-seed adds no further marker', () => {
+    fc.assert(fc.property(logArb, (events) => {
+      const original = build(events)
+      const once = new Session(SessionId(`idem-a-${counter++}`), [...original.events])
+      const twice = new Session(SessionId(`idem-b-${counter++}`), [...once.events])
+      // Lazy resume makes browsing a pickup, so this must not grow per open.
+      expect(twice.events).toEqual(once.events)
     }))
   })
 

packages/core/session/tests/repair.spec.ts

@@ -1,6 +1,6 @@
 import { describe, expect, it } from 'vitest'
 import { CallId , createMessage, createToolResultMessage } from '@deepseek-ai/dsh-llm'
-import { interruptedTurnClosers, TOOL_NOT_STARTED, TOOL_OUTCOME_UNKNOWN } from '../src/index.ts'
+import { interruptedTurnClosers, lastActivityTime, TOOL_NOT_STARTED, TOOL_OUTCOME_UNKNOWN } from '../src/index.ts'
 import type { SessionEvent, SurfaceEvent } from '../src/index.ts'
 
 /**
@@ -273,3 +273,44 @@ describe('interruptedTurnClosers', () => {
     expect(closers.map(e => e.type)).toEqual(['step/end', 'turn/end'])
   })
 })
+
+describe('lastActivityTime', () => {
+  const endSeedAt = (seq: number, time: number): SessionEvent =>
+    ({ type: 'session/end-seed', seq, time, data: {} })
+
+  it('has no answer for an empty log', () => {
+    expect(lastActivityTime([])).toBeUndefined()
+  })
+
+  it('reports the log tail when no boundary is present', () => {
+    const events: SessionEvent[] = [
+      userTurnStart(1, 0),
+      { type: 'turn/end', seq: 1, time: 500, data: { turn: 1, reason: { kind: 'completed' } } },
+    ]
+    expect(lastActivityTime(events)).toBe(500)
+  })
+
+  it('skips a trailing boundary in favour of the last real work', () => {
+    const events: SessionEvent[] = [
+      userTurnStart(1, 0),
+      { type: 'turn/end', seq: 1, time: 500, data: { turn: 1, reason: { kind: 'completed' } } },
+      endSeedAt(2, 9_000),
+    ]
+    // Resumed long after the work, but never worked in again.
+    expect(lastActivityTime(events)).toBe(500)
+  })
+
+  it('reports work appended after end-seed', () => {
+    const events: SessionEvent[] = [
+      userTurnStart(1, 0),
+      endSeedAt(1, 9_000),
+      { type: 'turn/end', seq: 2, time: 9_500, data: { turn: 1, reason: { kind: 'completed' } } },
+    ]
+    expect(lastActivityTime(events)).toBe(9_500)
+  })
+
+  it('has no answer for a log of nothing but boundaries', () => {
+    // Unreachable via the constructor, but the projection is a pure function.
+    expect(lastActivityTime([endSeedAt(0, 1), endSeedAt(1, 2)])).toBeUndefined()
+  })
+})

packages/core/session/tests/session.spec.ts

@@ -112,7 +112,7 @@ describe('Session', () => {
     session.append('turn/start', { turn: 1, trigger: { kind: 'message', source: { kind: 'user' } } })
     session.append('turn/end', { turn: 1, reason: { kind: 'aborted' } })
     const replayed = new Session(SessionId('aborted-replay'), structuredClone(session.events))
-    expect(replayed.events).toEqual(session.events)
+    expect(replayed.events.slice(0, -1)).toEqual(session.events)
     const turnEnd = replayed.events.findLast(event => event.type === 'turn/end')
     expect(turnEnd?.type === 'turn/end' && turnEnd.data.reason).toEqual({ kind: 'aborted' })
   })
@@ -188,7 +188,10 @@ describe('Session', () => {
 
     const replayed = new Session(SessionId('s3-replay'), [...original.events])
     expect(replayed.deriveMessages()).toEqual(original.deriveMessages())
-    expect(replayed.seq).toBe(original.seq)
+    // The seed verbatim, plus the end-seed event the constructor appends.
+    expect(replayed.events.slice(0, original.seq)).toEqual(original.events)
+    expect(replayed.seq).toBe(original.seq + 1)
+    expect(replayed.firstLiveSeq).toBe(original.seq)
   })
 
   it('rejects pre-provider request headers and assistant messages on seed/load', () => {
@@ -217,7 +220,7 @@ describe('Session', () => {
     const unrelatedPrimitiveData = {
       type: 'plugin/event', seq: 0, time: 1, data: null,
     } as unknown as SessionEvent
-    expect(new Session(SessionId('primitive-plugin-data'), [unrelatedPrimitiveData]).events)
+    expect(new Session(SessionId('primitive-plugin-data'), [unrelatedPrimitiveData]).events.slice(0, 1))
       .toEqual([unrelatedPrimitiveData])
   })
 
@@ -522,7 +525,8 @@ describe('Session', () => {
       { type: 'turn/end' as const, seq: 2, time: 3, data: { turn: 1, reason: { kind: 'completed' as const } } },
     ] as SessionEvent[]
     const session = new Session(SessionId('seed-ok'), goodSeed)
-    expect(session.events).toHaveLength(3)
+    expect(session.events.slice(0, 3)).toEqual(goodSeed)
+    expect(session.firstLiveSeq).toBe(3)
   })
 
   it('reads each seed array entry once so validation and storage use the same event', () => {
@@ -546,7 +550,7 @@ describe('Session', () => {
     const session = new Session(SessionId('seed-entry-snapshot'), seed)
 
     expect(reads).toBe(1)
-    expect(session.events).toEqual([accepted])
+    expect(session.events.slice(0, 1)).toEqual([accepted])
   })
 
   it('reads a nested seed-data getter once and stores its first JSON value', () => {
@@ -624,7 +628,7 @@ describe('Session', () => {
 
     const session = new Session(SessionId('seed-null-prototype'), [event])
 
-    expect(session.events).toEqual([{ ...event }])
+    expect(session.events.slice(0, 1)).toEqual([{ ...event }])
   })
 
   it('reads a nested seed-metadata getter once and stores its first JSON value', () => {
@@ -1647,6 +1651,7 @@ describe('todo/write event', () => {
     const replayed = new Session(SessionId('t4-replay'), [...original.events])
     expect(replayed.events.findLast(e => e.type === 'todo/write')!.data.todos)
       .toEqual([{ content: 'only', status: 'completed' }])
-    expect(replayed.seq).toBe(original.seq)
+    expect(replayed.events.slice(0, original.seq)).toEqual(original.events)
+    expect(replayed.firstLiveSeq).toBe(original.seq)
   })
 })

packages/core/system-prompt/README.i18n.yaml

@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write packages/core/system-prompt/README.md
-README.md: 79badba0b84b27c01f25e9c31b5df78c556411ea
-README.zh.md: fb3ed08bc9ea546033acac3b577980f500ce243d
+README.md: 23bc0e8177ad2a778df9522e254bfd5e03a9871f
+README.zh.md: 1fd4febc1c15acda19e7abfca94079b9585c1972

packages/core/system-prompt/README.md

@@ -8,6 +8,7 @@ System prompt assembly registry. Plugins contribute ordered sections, tool schem
 
 | Key | Default | Meaning |
 |---|---|---|
+| `includeHarnessIdentity` | `true` | Include the fixed `You are an AI agent powered by the DeepSeek Harness SDK.` order-−100 opener. Set false only when a compatibility deployment owns the complete system prompt. |
 | `persona` | `''` | The global deployment-persona default: the ONE config-authored prompt fragment, rendered as the order-0 `deployment:persona` section unless an agent-scoped contribution shadows it. A template — complete `{{…}}` groups are interpreted strictly against the registered variables (the shipped loop registers `{{model}}`/`{{cwd}}`), with no escape syntax for literal braces yet. Empty ⇒ the section is dropped at render. |
 | `toolOrder` | — | Explicit model-facing tool order, as a list of `ToolSchema.name`s with one `'<unlisted-tools>'` rest entry (`TOOL_ORDER_REST`): listed tools take their listed position, unlisted tools land at the rest entry in lexicographic name order. Absent ⇒ plain lexicographic name order. Applied to the collected tools BEFORE the `system-prompt/assemble` waterfall — like the sections' `order` sort, it canonicalizes what the registry contributed (registration order is a plugin-load artifact), and a waterfall listener that mutates the list owns the determinism of what it emits. Misconfiguration fails loud: a list without exactly one rest entry, or with duplicates, throws at load; a listed name with no registered tool rejects every `assemble()`; a tool provider returning the reserved rest-entry name also rejects. Under the shipped loop the turn fails before any model request. Why a central list and not per-plugin weights: [Explicit model-facing tool order](../../../.agents/notes/implemented/feature/2026-07-06-explicit-tool-order.md). |
 
@@ -48,7 +49,7 @@ Design rationale: [the prompt-variables Agent Note](../../../.agents/notes/imple
 
 #### What the model sees
 
-Every assembly starts with the harness identity below, then the configured persona and ordered plugin sections after strict variable interpolation. Empty sections disappear; scoped sections and variables can shadow globals for one agent. The final `system-prompt/assemble` waterfall result is authoritative, so an expert listener's changes determine the delivered prompt and tool schemas.
+By default every assembly starts with the harness identity below, then the configured persona and ordered plugin sections after strict variable interpolation. `includeHarnessIdentity: false` omits only that fixed opener for a deployment that owns the complete compatibility persona. Empty sections disappear; scoped sections and variables can shadow globals for one agent. The final `system-prompt/assemble` waterfall result is authoritative, so an expert listener's changes determine the delivered prompt and tool schemas.
 
 ##### Harness identity
 
@@ -58,7 +59,7 @@ You are an AI agent powered by the DeepSeek Harness SDK.
 
 #### Token effect
 
-Identity is a fixed per-request cost. Persona and plugin text are repeated per request and scale with their rendered content.
+Identity is a fixed per-request cost when enabled. Persona and plugin text are repeated per request and scale with their rendered content.
 
 #### KV Cache effect
 

packages/core/system-prompt/README.zh.md

@@ -8,6 +8,7 @@
 
 | 键 | 默认值 | 含义 |
 |---|---|---|
+| `includeHarnessIdentity` | `true` | 是否包含固定的 `You are an AI agent powered by the DeepSeek Harness SDK.`、顺序为 −100 的开场白。仅当兼容部署拥有完整系统提示词时设为 false。 |
 | `persona` | `''` | 全局部署 persona 默认值：唯一由配置创作的提示词片段，渲染为顺序为 0 的 `deployment:persona` 段，除非 agent 作用域的贡献将其遮蔽。它是模板，完整的 `{{…}}` 组会严格按已注册变量解释（随附循环注册 `{{model}}`/`{{cwd}}`），目前没有表达字面量花括号的转义语法。为空 ⇒ 渲染时删除该段。 |
 | `toolOrder` | 无 | 显式的面向模型工具顺序：一个 `ToolSchema.name` 列表，包含一个 `'<unlisted-tools>'` 其余项（`TOOL_ORDER_REST`）。已列工具占据列出的位置；未列工具按名称字典序落在其余项位置。缺席 ⇒ 直接按名称字典序排列。在 `system-prompt/assemble` waterfall（瀑布式事件）之前应用于已收集工具；与段的 `order` 排序一样，它会规范化注册表贡献的内容（注册顺序是插件加载产物），而修改列表的 waterfall 监听器拥有其输出的确定性。配置错误会明确失败：列表没有恰好一个其余项或存在重复项，会在加载时抛出；已列名称没有对应已注册工具，会使每次 `assemble()` 被拒绝；工具提供方返回保留的其余项名称也会被拒绝。在随附循环下，轮次会在任何模型请求前失败。为何采用中心列表而非每插件权重，见[显式面向模型工具顺序](../../../.agents/notes/implemented/feature/2026-07-06-explicit-tool-order.md)。 |
 
@@ -48,7 +49,7 @@
 
 #### 模型看到的内容
 
-每次组装都从下方 harness 身份开始，然后在严格变量插值后追加已配置 persona 与有序插件段。空段会消失；带作用域的段和变量可以为一个 agent 遮蔽全局项。最终 `system-prompt/assemble` waterfall 结果是权威来源，因此专家监听器的变更决定交付的提示词与工具 schema。
+默认情况下，每次组装都从下方 harness 身份开始，然后在严格变量插值后追加已配置 persona 与有序插件段。`includeHarnessIdentity: false` 仅为拥有完整兼容 persona 的部署省略这个固定开场白。空段会消失；带作用域的段和变量可以为一个 agent 遮蔽全局项。最终 `system-prompt/assemble` waterfall 结果是权威来源，因此专家监听器的变更决定交付的提示词与工具 schema。
 
 ##### Harness 身份
 
@@ -58,7 +59,7 @@ You are an AI agent powered by the DeepSeek Harness SDK.
 
 #### Token 影响
 
-身份是每次请求的固定成本。Persona 与插件文本在每次请求中重复，成本随渲染内容增长。
+启用时，身份是每次请求的固定成本。Persona 与插件文本在每次请求中重复，成本随渲染内容增长。
 
 #### KV Cache 影响
 

packages/core/system-prompt/src/index.ts

@@ -145,6 +145,8 @@ function compareToolNames(a: ToolSchema, b: ToolSchema): number {
 
 /** Plugin config: the deployment-authored fragment of the system prompt (see {@link Config.persona} for its contract). */
 export interface Config {
+  /** Include the fixed DeepSeek Harness identity before the deployment persona (default true). */
+  includeHarnessIdentity?: boolean
   /**
    * Deployment-wide order-0 persona template. A scoped section named
    * `deployment:persona` shadows it; `{{variable}}` references are strict.
@@ -245,6 +247,7 @@ class PromptLayer implements ScopeLayer {
 /** Registry service for the prompt inputs assembled before each model step. */
 export class SystemPrompt extends Service {
   static Config: z<Config> = z.object({
+    includeHarnessIdentity: z.boolean().default(true),
     persona: z.string().default(''),
     // Preserve omission because an explicit empty order lacks the rest marker.
     toolOrder: z.array(z.string()).default(undefined as unknown as string[]),
@@ -260,11 +263,13 @@ export class SystemPrompt extends Service {
     super(ctx, 'systemPrompt')
     this.toolOrder = validateToolOrder(config.toolOrder)
     // Keep harness-owned openers independent of the selected loop plugin.
-    this.section({
-      name: 'harness:identity',
-      order: -100,
-      text: 'You are an AI agent powered by the DeepSeek Harness SDK.',
-    })
+    if (config.includeHarnessIdentity ?? true) {
+      this.section({
+        name: 'harness:identity',
+        order: -100,
+        text: 'You are an AI agent powered by the DeepSeek Harness SDK.',
+      })
+    }
     this.section({
       name: 'deployment:persona',
       order: 0,

packages/core/system-prompt/tests/system-prompt.spec.ts

@@ -37,6 +37,18 @@ describe('SystemPrompt', () => {
       expect(renderPrompt(await ctx.systemPrompt.assemble())).toBe(IDENTITY)
     })
 
+    it('can omit the harness identity for a deployment that owns the complete persona', async () => {
+      const ctx = new Context()
+      await ctx.plugin(SystemPrompt, {
+        includeHarnessIdentity: false,
+        persona: 'You are a helpful software engineer assistant.',
+      })
+
+      const assembly = await ctx.systemPrompt.assemble()
+      expect(assembly.sections.map(section => section.name)).toEqual(['deployment:persona'])
+      expect(renderPrompt(assembly)).toBe('You are a helpful software engineer assistant.')
+    })
+
     it('tolerates a schema-bypassing direct construction (persona omitted)', async () => {
       // ctx.plugin validates + defaults the config first; a direct construction
       // skips the schema, so the ctor's `?? ''` narrowing is what fires.

packages/core/tools/tests/gen-tool-catalog.spec.ts

@@ -23,7 +23,7 @@ describe('gen-tool-catalog collectToolCatalog', () => {
   it('boots every shipped tool package and harvests its model-facing schemas', async () => {
     const catalog = await collectToolCatalog()
     const names = catalog.flatMap(entry => entry.schemas.map(s => s.name)).sort()
-    expect(names).toEqual(['ask_user_question', 'bash', 'cordis_inspect', 'cordis_mount', 'cordis_unmount', 'create_goal', 'edit', 'exit_plan_mode', 'get_goal', 'glob', 'grep', 'lsp', 'ralph', 'read', 'run_code', 'session_event_read', 'session_event_search', 'session_event_trace', 'session_search', 'session_trace', 'skill', 'subagent', 'task_kill', 'task_list', 'task_output', 'terminal_close', 'terminal_list', 'terminal_open', 'terminal_read', 'terminal_send', 'terminal_signal', 'todo_write', 'update_goal', 'web_fetch', 'web_search', 'workflow', 'write'])
+    expect(names).toEqual(['ask_user_question', 'bash', 'bash', 'cordis_inspect', 'cordis_mount', 'cordis_unmount', 'create_goal', 'edit', 'exit_plan_mode', 'get_goal', 'glob', 'grep', 'lsp', 'ralph', 'read', 'run_code', 'session_event_read', 'session_event_search', 'session_event_trace', 'session_search', 'session_trace', 'skill', 'str_replace_editor', 'subagent', 'task_kill', 'task_list', 'task_output', 'terminal_close', 'terminal_list', 'terminal_open', 'terminal_read', 'terminal_send', 'terminal_signal', 'todo_write', 'update_goal', 'web_fetch', 'web_search', 'workflow', 'write'])
     // Every tool carries a JSON-Schema `parameters` object (what the model sees).
     for (const entry of catalog) {
       for (const schema of entry.schemas) {

packages/examples/agent-spine-demo/README.i18n.yaml

@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write packages/examples/agent-spine-demo/README.md
-README.md: 359e7153be2f480ba3fea4b06782acdc9f89ebb9
-README.zh.md: acd8c06940b03e90e368314cd725846a2b92b656
+README.md: 6bbd99217bcdce0e8a0e8fd22a8d39d0c64224b9
+README.zh.md: 4a7e7a1b7eced9317f94eeddf2442ded9a3e0e13

packages/examples/agent-spine-demo/README.md

@@ -31,7 +31,7 @@ Read this package for the whole plugin tree and its composition order.
 @deepseek-ai/dsh-scope/invariant
 @deepseek-ai/dsh-agent-loop/invariant
                                   package-owned relational checks
-@deepseek-ai/dsh-tool-bash        the model-facing bash schema
+@deepseek-ai/dsh-tool-bash        the model-facing bash schema (unless toolBash=false)
 @deepseek-ai/dsh-workspace-context  AGENTS.md/CLAUDE.md workspace context loader
 @deepseek-ai/dsh-tool-skill       session-prefix skill catalog + model-facing loader schema
 @deepseek-ai/dsh-tool-tasks       task_output/task_list/task_kill schemas + completion notices
@@ -55,11 +55,11 @@ This is the [interface/implementation/consumer seam](../../../.agents/notes/impl
 
 ```ts
 import type { Config } from '@deepseek-ai/dsh-agent-spine-demo'
-// { agents?, maxParallelToolCalls?, persona?, toolOrder?, tools?, dshHome?, sessionTitle?, skills?, workspaceContext, toolBash?, toolTasks?, goals?, invariants? }
+// { agents?, maxParallelToolCalls?, includeHarnessIdentity?, persona?, toolOrder?, tools?, dshHome?, sessionTitle?, skills?, workspaceContext, toolBash?, toolTasks?, goals?, invariants? }
 // workspaceContext requires { maxBytes } or false; the other owner schemas supply defaults.
 ```
 
-The bundle FORWARDS each field to the child that owns it: `agents` and `maxParallelToolCalls` to `agent-loop` (`agents` defaults to `[]`; the cap defaults there), so each app supplies its own pre-created agents — TUI and headless apps pre-create `main`, while the ACP app creates agents on demand at `session/new`; `persona` and `toolOrder` to `dsh-system-prompt`; `tools` to the tool registry for its presentation mode; `sessionTitle` to the fallback title service; `skills.registry`, `skills.local`, and `skills.tool` to the skill registry, local provider, and model-facing consumer; the required `workspaceContext` choice to `dsh-workspace-context` (`{ maxBytes }` enables loading and `false` disables it); `invariants` to the invariant service; and `toolBash`/`toolTasks` to the two model-facing tool plugins the bundle owns. It always mounts `dsh-llm-retry`, while each leaf adapter owns its nested `retryPolicy`. Omitted `sessionTitle` uses the explicit example policy of 5 words, 40 fallback bytes, and 80 accepted-title bytes. A `goals` object opts into the persisted domain, model tools, and same-session driver while forwarding `goals.domain` and `goals.tool` to their owners; omission or `false` leaves the stack absent so headless callers retain one-turn settlement. Set `skills.enabled: false` to omit both the local provider and model-facing skill tool, and set `toolTasks: false` to retain the task service for foreground producers without exposing `task_output` / `task_list` / `task_kill`. It resolves `dshHome` once through [`@deepseek-ai/dsh-paths`](../../util/paths/README.md) and forwards that absolute value to tool-bash's managed environment and enabled local skill discovery. An absent top-level `dshHome` adopts `skills.local.dshHome`; supplying both with different resolved paths fails loudly. `toolBash.enableRunInBackground` controls only the bash producer; independently loaded producers keep their own config. Workspace instructions register before the skill catalog so their session-prefix message renders first. App packages use `pickSpineConfig()` to copy only these bundle-owned fields.
+The bundle FORWARDS each field to the child that owns it: `agents` and `maxParallelToolCalls` to `agent-loop` (`agents` defaults to `[]`; the cap defaults there), so each app supplies its own pre-created agents — TUI and headless apps pre-create `main`, while the ACP app creates agents on demand at `session/new`; `includeHarnessIdentity`, `persona`, and `toolOrder` to `dsh-system-prompt`; `tools` to the tool registry for its presentation mode; `sessionTitle` to the fallback title service; `skills.registry`, `skills.local`, and `skills.tool` to the skill registry, local provider, and model-facing consumer; the required `workspaceContext` choice to `dsh-workspace-context` (`{ maxBytes }` enables loading and `false` disables it); `invariants` to the invariant service; and `toolBash`/`toolTasks` to the two model-facing tool plugins the bundle owns. It always mounts `dsh-llm-retry`, while each leaf adapter owns its nested `retryPolicy`. Omitted `sessionTitle` uses the explicit example policy of 5 words, 40 fallback bytes, and 80 accepted-title bytes. A `goals` object opts into the persisted domain, model tools, and same-session driver while forwarding `goals.domain` and `goals.tool` to their owners; omission or `false` leaves the stack absent so headless callers retain one-turn settlement. Set `skills.enabled: false` to omit both the local provider and model-facing skill tool, set `toolBash: false` when another plugin owns the `bash` tool name, and set `toolTasks: false` to retain the task service for foreground producers without exposing `task_output` / `task_list` / `task_kill`. It resolves `dshHome` once through [`@deepseek-ai/dsh-paths`](../../util/paths/README.md) and forwards that absolute value to tool-bash's managed environment and enabled local skill discovery. An absent top-level `dshHome` adopts `skills.local.dshHome`; supplying both with different resolved paths fails loudly. `toolBash.enableRunInBackground` controls only the bundled bash producer; independently loaded producers keep their own config. Workspace instructions register before the skill catalog so their session-prefix message renders first. App packages use `pickSpineConfig()` to copy only these bundle-owned fields.
 
 For example, `{ invariants: { enabled: true, package_allowlist: ['^@deepseek-ai/dsh-'], package_blocklist: ['agent-loop$'] } }` keeps the package-owned companions mounted but suppresses the blocked owner. Blocklist matches override allowlist matches; see [`dsh-invariants`](../../support/invariants/README.md) for regex and lifecycle rules.
 
@@ -79,5 +79,5 @@ No direct invalidation; the named consumer owns any request-prefix changes.
 
 ## Known Limitations and Deferred Work
 
-- **Most of the spine set is fixed in code** — `apply()` always mounts the core services and `tool-bash`; config can omit bundled goals, skills, and task-control tools, but swapping the loop or dropping another spine member means composing a different bundle.
+- **Most of the spine set is fixed in code** — `apply()` always mounts the core services; config can omit bundled goals, skills, bash, and task-control tools, but swapping the loop or dropping another spine member means composing a different bundle.
 - **The invariant seam and companions remain fixed members** — `invariants.enabled: false` or package filters suppress checks but do not remove the service or companion registrations; Session's always-on validation and freezing are separate.

packages/examples/agent-spine-demo/README.zh.md

@@ -31,7 +31,7 @@
 @deepseek-ai/dsh-scope/invariant
 @deepseek-ai/dsh-agent-loop/invariant
                                   package-owned relational checks
-@deepseek-ai/dsh-tool-bash        the model-facing bash schema
+@deepseek-ai/dsh-tool-bash        the model-facing bash schema (unless toolBash=false)
 @deepseek-ai/dsh-workspace-context  AGENTS.md/CLAUDE.md workspace context loader
 @deepseek-ai/dsh-tool-skill       session-prefix skill catalog + model-facing loader schema
 @deepseek-ai/dsh-tool-tasks       task_output/task_list/task_kill schemas + completion notices
@@ -55,11 +55,11 @@
 
 ```ts
 import type { Config } from '@deepseek-ai/dsh-agent-spine-demo'
-// { agents?, maxParallelToolCalls?, persona?, toolOrder?, tools?, dshHome?, sessionTitle?, skills?, workspaceContext, toolBash?, toolTasks?, goals?, invariants? }
+// { agents?, maxParallelToolCalls?, includeHarnessIdentity?, persona?, toolOrder?, tools?, dshHome?, sessionTitle?, skills?, workspaceContext, toolBash?, toolTasks?, goals?, invariants? }
 // workspaceContext requires { maxBytes } or false; the other owner schemas supply defaults.
 ```
 
-组合包将每个字段转发给拥有它的子节点：`agents` 与 `maxParallelToolCalls` 交给 `agent-loop`（`agents` 默认为 `[]`，上限在该处默认），因此每个应用提供自己的预创建 agent；TUI 和无头应用预创建 `main`，ACP 应用则在 `session/new` 按需创建 agent；`persona` 与 `toolOrder` 交给 `dsh-system-prompt`；`tools` 交给工具注册表以配置呈现模式；`sessionTitle` 交给后备标题服务；`skills.registry`、`skills.local` 与 `skills.tool` 分别交给 skill 注册表、本地提供方和面向模型的消费方；必填的 `workspaceContext` 选择交给 `dsh-workspace-context`（`{ maxBytes }` 启用加载，`false` 禁用）；`invariants` 交给不变式服务；`toolBash`/`toolTasks` 交给组合包拥有的两个面向模型工具插件。组合包始终挂载 `dsh-llm-retry`，而每个叶节点适配器拥有自己的嵌套 `retryPolicy`。省略 `sessionTitle` 时采用显式示例策略：5 个词、40 个后备字节、80 个可接受标题字节。`goals` 对象会选用持久化领域、模型工具和同会话 Goal Round 驱动器，并将 `goals.domain` 与 `goals.tool` 转发给各自拥有者；省略或设为 `false` 会让整个栈缺席，使无头调用方继续以单轮次结算。设置 `skills.enabled: false` 会同时省略本地提供方和面向模型的 skill 工具；设置 `toolTasks: false` 会保留供前台生产方使用的任务服务，但不公开 `task_output`/`task_list`/`task_kill`。它对 `dshHome` 只解析一次，解析通过 [`@deepseek-ai/dsh-paths`](../../util/paths/README.md) 完成，并将所得绝对值转发给 tool-bash 的托管环境和已启用的本地 skill 发现。顶层 `dshHome` 缺席时采用 `skills.local.dshHome`；两者同时提供但解析后的路径不同会明确失败。`toolBash.enableRunInBackground` 只控制 bash 生产方；独立加载的生产方保留各自配置。工作区指令先于 skill 目录注册，因此其会话前缀消息先渲染。应用包使用 `pickSpineConfig()`，只复制这些由组合包拥有的字段。
+组合包将每个字段转发给拥有它的子节点：`agents` 与 `maxParallelToolCalls` 交给 `agent-loop`（`agents` 默认为 `[]`，上限在该处默认），因此每个应用提供自己的预创建 agent；TUI 和无头应用预创建 `main`，ACP 应用则在 `session/new` 按需创建 agent；`includeHarnessIdentity`、`persona` 与 `toolOrder` 交给 `dsh-system-prompt`；`tools` 交给工具注册表以配置呈现模式；`sessionTitle` 交给后备标题服务；`skills.registry`、`skills.local` 与 `skills.tool` 分别交给 skill 注册表、本地提供方和面向模型的消费方；必填的 `workspaceContext` 选择交给 `dsh-workspace-context`（`{ maxBytes }` 启用加载，`false` 禁用）；`invariants` 交给不变式服务；`toolBash`/`toolTasks` 交给组合包拥有的两个面向模型工具插件。组合包始终挂载 `dsh-llm-retry`，而每个叶节点适配器拥有自己的嵌套 `retryPolicy`。省略 `sessionTitle` 时采用显式示例策略：5 个词、40 个后备字节、80 个可接受标题字节。`goals` 对象会选用持久化领域、模型工具和同会话 Goal Round 驱动器，并将 `goals.domain` 与 `goals.tool` 转发给各自拥有者；省略或设为 `false` 会让整个栈缺席，使无头调用方继续以单轮次结算。设置 `skills.enabled: false` 会同时省略本地提供方和面向模型的 skill 工具；当另一个插件拥有 `bash` 工具名时设置 `toolBash: false`；设置 `toolTasks: false` 会保留供前台生产方使用的任务服务，但不公开 `task_output`/`task_list`/`task_kill`。它对 `dshHome` 只解析一次，解析通过 [`@deepseek-ai/dsh-paths`](../../util/paths/README.md) 完成，并将所得绝对值转发给 tool-bash 的托管环境和已启用的本地 skill 发现。顶层 `dshHome` 缺席时采用 `skills.local.dshHome`；两者同时提供但解析后的路径不同会明确失败。`toolBash.enableRunInBackground` 只控制内置 bash 生产方；独立加载的生产方保留各自配置。工作区指令先于 skill 目录注册，因此其会话前缀消息先渲染。应用包使用 `pickSpineConfig()`，只复制这些由组合包拥有的字段。
 
 例如，`{ invariants: { enabled: true, package_allowlist: ['^@deepseek-ai/dsh-'], package_blocklist: ['agent-loop$'] } }` 会让包拥有的配套插件保持挂载，但抑制被阻止的拥有者。Blocklist 匹配优先于 allowlist 匹配；正则表达式与生命周期规则见 [`dsh-invariants`](../../support/invariants/README.md)。
 
@@ -79,5 +79,5 @@ YAML include 可以去重配置，却无法拥有 bin 或提供前端入口默
 
 ## 已知限制与暂缓事项
 
-- **大部分主干集合固定在代码中**：`apply()` 始终挂载核心服务与 `tool-bash`；配置可以省略组合包内的目标、skill 与任务控制工具，但要替换循环或删除其他主干成员，就必须组合另一个组合包。
+- **大部分主干集合固定在代码中**：`apply()` 始终挂载核心服务；配置可以省略组合包内的目标、skill、bash 与任务控制工具，但要替换循环或删除其他主干成员，就必须组合另一个组合包。
 - **不变式 seam 与配套插件仍是固定成员**：`invariants.enabled: false` 或包筛选器会抑制检查，但不会移除服务或配套插件注册；Session 始终启用的校验与冻结是另一套机制。

packages/examples/agent-spine-demo/src/index.ts

@@ -68,9 +68,9 @@ export interface GoalConfig {
 /**
  * Bundle config: each field forwarded verbatim to the child that owns it —
  * `agents` to the agent loop (an app that pre-creates no agents, like the ACP
- * bridge, simply omits it), `persona` and `toolOrder` to the system-prompt
- * plugin (the deployment's persona section and the explicit model-facing tool
- * order), the `tools` object to the tool registry (its presentation `mode`),
+ * bridge, simply omits it), `includeHarnessIdentity`, `persona`, and `toolOrder`
+ * to the system-prompt plugin (the fixed opener, deployment persona, and explicit
+ * model-facing tool order), the `tools` object to the tool registry (its presentation `mode`),
  * `dshHome` to bash environment and local skill discovery, `sessionTitle` to
  * the fallback title service, `skills` to the
  * skill registry/local provider/tool consumer, `workspaceContext` to the
@@ -83,13 +83,16 @@ export interface GoalConfig {
  * workspace context instead requires an explicit byte budget or `false` because
  * it changes model-visible input. Producer opt-in stays producer-local:
  * `toolBash` configures bash only; independently composed producers keep their
- * own config.
+ * own config. Set `toolBash: false` when another plugin owns the model-facing
+ * `bash` name.
  */
 export interface Config {
   /** The agent-loop `agents` list (see dsh-agent-loop's `Config`). */
   agents?: AgentLoopConfig['agents']
   /** Agent-loop concurrency cap; `1` is serial. */
   maxParallelToolCalls?: AgentLoopConfig['maxParallelToolCalls']
+  /** Whether the system prompt includes the fixed Harness identity (default true). */
+  includeHarnessIdentity?: SystemPromptConfig['includeHarnessIdentity']
   /** The deployment persona (see dsh-system-prompt's `Config`). */
   persona?: SystemPromptConfig['persona']
   /** The explicit model-facing tool order (see dsh-system-prompt's `Config`). */
@@ -102,10 +105,14 @@ export interface Config {
   sessionTitle?: SessionTitleConfig
   /** Workspace-context loader controls with an explicit byte budget; set `false` for hermetic prompts. */
   workspaceContext: workspaceContext.Config | false
-  /** Skill registry, local provider, and model-facing consumer config. */
+  /**
+   * Skill registry, local provider, and model-facing consumer config.
+   * Skills use `enabled` because one nested config controls a provider stack;
+   * single model-tool plugins use `Config | false` to disable that one consumer.
+   */
   skills?: SkillConfig
-  /** Model-facing bash tool config, including this producer's background opt-in. */
-  toolBash?: toolBash.Config
+  /** Model-facing bash tool config, or false when another plugin owns `bash`. */
+  toolBash?: toolBash.Config | false
   /** Generic background-task controls; set false to keep the task service without model-facing task tools. */
   toolTasks?: toolTasks.Config | false
   /** Global enablement and package-name filters for invariant companions. */
@@ -127,7 +134,8 @@ export const SessionTitleConfigSchema: z<SessionTitleConfig> = SessionTitleServi
   .default(EXAMPLE_SESSION_TITLE_CONFIG)
 
 /** The bash-tool config schema exported for app packages that forward `toolBash`. */
-export const ToolBashConfigSchema: z<toolBash.Config> = toolBash.Config
+export const ToolBashConfigSchema: z<toolBash.Config | false> =
+  z.union([z.const(false), toolBash.Config])
 
 /** The task-control-tool config schema exported for app packages that forward `toolTasks`. */
 export const ToolTasksConfigSchema: z<toolTasks.Config> = toolTasks.Config
@@ -163,6 +171,7 @@ export const Config = z.intersect([
 export function pickSpineConfig(config: Omit<Config, 'agents'>): Omit<Config, 'agents'> {
   return {
     ...config.maxParallelToolCalls !== undefined ? { maxParallelToolCalls: config.maxParallelToolCalls } : {},
+    ...config.includeHarnessIdentity !== undefined ? { includeHarnessIdentity: config.includeHarnessIdentity } : {},
     ...config.persona !== undefined ? { persona: config.persona } : {},
     ...config.toolOrder !== undefined ? { toolOrder: config.toolOrder } : {},
     ...config.tools !== undefined ? { tools: config.tools } : {},
@@ -201,6 +210,7 @@ export function apply(ctx: Context, config: Config): void {
   ctx.plugin(SessionTitleService, config.sessionTitle ?? EXAMPLE_SESSION_TITLE_CONFIG)
   // Owner schemas resolve defaults; forward toolOrder only when explicitly set.
   ctx.plugin(SystemPrompt, {
+    includeHarnessIdentity: config.includeHarnessIdentity ?? true,
     persona: config.persona ?? '',
     ...config.toolOrder !== undefined ? { toolOrder: config.toolOrder } : {},
   })
@@ -223,7 +233,9 @@ export function apply(ctx: Context, config: Config): void {
   ctx.plugin(agentInvariant)
   ctx.plugin(scopeInvariant)
   ctx.plugin(agentLoopInvariant)
-  ctx.plugin(toolBash, Object.assign({}, config.toolBash, { dshHome }))
+  if (config.toolBash !== false) {
+    ctx.plugin(toolBash, Object.assign({}, config.toolBash, { dshHome }))
+  }
   if (config.workspaceContext !== false) {
     ctx.plugin(workspaceContext, config.workspaceContext)
   }

packages/examples/agent-spine-demo/tests/agent-core.spec.ts

@@ -4,7 +4,7 @@ import { join } from 'node:path'
 import { tmpdir } from 'node:os'
 import { Context } from 'cordis'
 import Loader from '@cordisjs/plugin-loader'
-import { TOOL_ORDER_REST } from '@deepseek-ai/dsh-system-prompt'
+import { renderPrompt, TOOL_ORDER_REST } from '@deepseek-ai/dsh-system-prompt'
 import * as agentCore from '../src/index.ts'
 import { agentEvents, type Agent } from '@deepseek-ai/dsh-agent'
 import { SessionId } from '@deepseek-ai/dsh-session'
@@ -654,9 +654,27 @@ describe('dsh-agent-spine-demo bundle', () => {
     await ctx.fiber.dispose()
   })
 
+  it('can omit the bundled bash tool and Harness identity for a compatibility deployment', async () => {
+    const ctx = await mount({
+      includeHarnessIdentity: false,
+      persona: 'You are a helpful software engineer assistant.',
+      workspaceContext: false,
+      skills: { enabled: false },
+      toolBash: false,
+      toolTasks: false,
+    }, true)
+
+    expect(ctx.tools.schemas()).toEqual([])
+    expect(renderPrompt(await ctx.systemPrompt.assemble()))
+      .toBe('You are a helpful software engineer assistant.')
+
+    await ctx.fiber.dispose()
+  })
+
   it('picks shared spine config without leaking front-door fields', () => {
     const appConfig = {
       model: 'front-door-only',
+      includeHarnessIdentity: false,
       persona: 'You are merged.',
       toolOrder: ['zulu'],
       tools: { mode: 'native' as const },
@@ -670,6 +688,7 @@ describe('dsh-agent-spine-demo bundle', () => {
     }
 
     expect(agentCore.pickSpineConfig(appConfig)).toEqual({
+      includeHarnessIdentity: appConfig.includeHarnessIdentity,
       persona: appConfig.persona,
       toolOrder: appConfig.toolOrder,
       tools: appConfig.tools,

packages/fs/README.i18n.yaml

@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write packages/fs/README.md
-README.md: 4d954455ea920be4882530bcfe90b48a364c29b5
-README.zh.md: ed154cbbaf7c7f45c42c17799957254fee918153
+README.md: b5e0ac9d1c0c550eb372b8a66fc6358711fddc07
+README.zh.md: ee64a617aa0d9549bcaf00b20821a6d59c6673c8

packages/fs/README.md

@@ -12,6 +12,7 @@ The filesystem stack: a provider seam (text IO + atomic mutation with an optiona
 | `fs-policy/` | Policy gate plugin: observed-state + read-before-edit + version-guarded write/edit, via the `fs/*` event gate | (no service — `fs/*` listeners) |
 | `tool-fs/` | Model-facing `read`/`write`/`edit` tools AND the executor (reads via `ctx.fs`, owns read windowing, dispatches `fs/*`); preserves filesystem semantics for session-cwd-relative paths and advertises sandbox escalation fields when the mounted `ctx.fs` confines | (registers on `ctx.tools`) |
 | `tool-fs-search/` | Model-facing `glob`/`grep` discovery tools when `rg` is available on the bash executor `PATH`, backed by fixed ripgrep commands through `ctx.bash`, NOT by `ctx.fs` provider methods | (registers on `ctx.tools`) |
+| `tool-str-replace-editor/` | Model-facing `str_replace_editor` with view/create/unique literal replace/line insert operations over `ctx.fs` | (registers on `ctx.tools`) |
 
 The interface lives at `fs/fs/`. A sandboxed, remote, or project-scoped filesystem backend can replace `fs-local` without touching the seam, the policy gate, or the model-facing tool schemas — `fs-sandbox` is the first such replacement (an in-process path fence over the shared sandbox mode; see [the cross-family fs sandbox Agent Note](../../.agents/notes/implemented/feature/2026-07-14-cross-family-fs-sandbox.md)). The policy (`fs-policy/`) is a plugin that participates only through the `fs/*` event gate, not a service the tool injects — so dropping it gracefully loses the policy and leaves the unconstrained bare provider rather than breaking the tool. A deployment that loads `tool-fs/` is expected to also load it. The mode fence and the read-before-edit gate are orthogonal and compose. Discovery (`tool-fs-search/`) deliberately does NOT extend the provider seam: search is a process-backed `rg` workflow on the bash executor, so filesystem backends stay free of a universal search contract; its tools register only when that executor can find `rg`, and its results are follow-up-readable when the bash workdir and the `read` root are the same workspace (the co-located deployment its README documents).
 

packages/fs/README.zh.md

@@ -12,6 +12,7 @@
 | `fs-policy/` | 策略门禁插件：通过 `fs/*` 事件门禁提供已观察状态、编辑前读取和版本防护的写入/编辑 | （无服务，仅有 `fs/*` 监听器） |
 | `tool-fs/` | 面向模型的 `read`/`write`/`edit` 工具以及执行器（通过 `ctx.fs` 读取，拥有读取窗口逻辑，分派 `fs/*`）；为会话 cwd 相对路径保留文件系统语义，并在已挂载的 `ctx.fs` 实施约束时声明沙箱升权字段 | （注册到 `ctx.tools`） |
 | `tool-fs-search/` | 面向模型的 `glob`/`grep` 发现工具；当 `rg` 位于 bash 执行器 `PATH` 上时注册，通过 `ctx.bash` 运行固定 ripgrep 命令，而不是使用 `ctx.fs` 提供方方法 | （注册到 `ctx.tools`） |
+| `tool-str-replace-editor/` | 基于 `ctx.fs` 提供查看／创建／唯一字面量替换／按行插入的模型可见 `str_replace_editor` | （注册到 `ctx.tools`） |
 
 接口位于 `fs/fs/`。沙箱化、远程或限定项目作用域的文件系统后端可以替换 `fs-local`，而无需更改 seam、策略门禁或面向模型的工具 schema；`fs-sandbox` 是第一个这样的替代实现（基于共享沙箱模式的进程内路径围栏；见[跨能力族 fs 沙箱 Agent Note（agent 决策记录）](../../.agents/notes/implemented/feature/2026-07-14-cross-family-fs-sandbox.md)）。策略（`fs-policy/`）是一个只通过 `fs/*` 事件门禁参与的插件，不是工具注入的服务；因此移除它只会使策略失效，留下不受约束的裸提供方，而不会破坏工具。加载 `tool-fs/` 的部署也应加载该插件。模式围栏与编辑前读取门禁彼此正交，可以组合。发现（`tool-fs-search/`）有意不扩展提供方 seam：搜索是在 bash 执行器上运行 `rg`、基于进程的工作流，因此文件系统后端无需承担通用搜索契约；只有当执行器能找到 `rg` 时，其工具才会注册。如果 bash 工作目录与 `read` 根目录是同一工作区，其结果便可供后续读取，这也是其 README 所述的共置部署。
 

packages/fs/tool-str-replace-editor/README.i18n.yaml

@@ -0,0 +1,6 @@
+# Bilingual-pair consistency record (docs/i18n/README.md): the git blob hash of each
+# side as of the last confirmed-consistent state. Both languages carry equal authority;
+# after editing either side, bring the other along and re-record with:
+#   pnpm run verify-translation-pairing --write packages/fs/tool-str-replace-editor/README.md
+README.md: 97e9e0ab9ade7c7241c1aac3e2489e055d01ff8f
+README.zh.md: 48358eb3c9d81ddad6a83c4ff3ef0cf6542096b1

packages/fs/tool-str-replace-editor/README.md

@@ -0,0 +1,52 @@
+# @deepseek-ai/dsh-tool-str-replace-editor
+
+English | [中文](README.zh.md)
+
+Standalone model-facing `str_replace_editor` over `ctx.fs`. It can be composed with persistent Bash, one-shot Bash, sandboxed Bash, or another terminal surface.
+
+## Config
+
+| Key | Default | Meaning |
+|---|---:|---|
+| `maxOutputChars` | `16000` | Prefix characters retained for file and directory views. |
+| `description` | Editor command guide | Model-facing tool description. |
+
+## Tool
+
+The schema provides `view`, `create`, `str_replace`, and `insert` over absolute paths. File views use one-based line numbers and preserve content tabs, so displayed text remains valid literal replacement input; directory views omit hidden, dependency, and Python-cache entries and descend two levels. Replacement requires one unique literal match and reports errors only in the public `old_str` vocabulary. Insert follows the selected zero-based insertion boundary without adding an implicit trailing newline. Mutations preserve tabs outside the requested edit.
+
+## Model Experience
+
+### Tool schema
+
+#### What the model sees
+
+The generated [`str_replace_editor` schema](../../../docs/tool-catalog.md#deepseek-aidsh-tool-str-replace-editor), including the configured `description`. The plugin contributes no standalone system-prompt section.
+
+#### Token effect
+
+Fixed schema cost while `str_replace_editor` is visible.
+
+#### KV Cache effect
+
+Prefix-stable while the configured description and schema remain unchanged.
+
+### Tool results
+
+#### What the model sees
+
+Views return numbered text or a shallow directory listing. Calls expose file locations, and create/replace calls expose diff cards to presentation surfaces. Mutations return concise confirmations. Long views keep their prefix and append a clipping notice.
+
+#### Token effect
+
+Data-dependent and bounded by `maxOutputChars` plus the fixed clipping notice.
+
+#### KV Cache effect
+
+Append-only tool results follow the reusable request prefix.
+
+## Known Limitations and Deferred Work
+
+- Operations target UTF-8 text; binary files are unsupported.
+- `str_replace` intentionally rejects zero or multiple matches and has no `replace_all` argument.
+- Every mutation goes through `fs/write-intent` or `fs/edit-intent`, resolves the current session sandbox policy, and delegates enforcement to the mounted filesystem and policy plugins.

packages/fs/tool-str-replace-editor/README.zh.md

@@ -0,0 +1,52 @@
+# @deepseek-ai/dsh-tool-str-replace-editor
+
+[English](README.md) | 中文
+
+基于 `ctx.fs` 的独立模型可见 `str_replace_editor`。它可与持久 Bash、一次性 Bash、沙箱 Bash 或其他终端表面组合。
+
+## 配置
+
+| 键 | 默认值 | 含义 |
+|---|---:|---|
+| `maxOutputChars` | `16000` | 文件和目录查看结果保留的前缀字符数。 |
+| `description` | 编辑器命令指南 | 面向模型的工具描述。 |
+
+## 工具
+
+Schema 提供针对绝对路径的 `view`、`create`、`str_replace` 与 `insert`。文件查看使用从一开始的行号，并保留内容中的制表符，因此显示的文本仍可作为有效的字面量替换输入；目录查看忽略隐藏、依赖与 Python 缓存条目并下探两层。替换要求字面量唯一匹配，错误只使用公开的 `old_str` 词汇。插入遵循所选的零基插入边界，不会隐式补尾换行。修改操作会保留请求编辑范围之外的制表符。
+
+## 模型体验
+
+### 工具 schema
+
+#### 模型所见
+
+生成的 [`str_replace_editor` schema](../../../docs/tool-catalog.md#deepseek-aidsh-tool-str-replace-editor)，其中包含配置的 `description`。本插件不贡献独立系统提示词段。
+
+#### Token 影响
+
+`str_replace_editor` 可见时产生固定的 schema 成本。
+
+#### KV Cache 影响
+
+配置的描述与 schema 不变时前缀稳定。
+
+### 工具结果
+
+#### 模型所见
+
+查看操作返回带行号文本或浅层目录列表。调用会向展示层提供文件位置，创建/替换还会提供 diff 卡片。修改操作返回简洁确认。长查看结果保留前缀并追加截断提示。
+
+#### Token 影响
+
+随数据变化，并受 `maxOutputChars` 与固定截断提示约束。
+
+#### KV Cache 影响
+
+工具结果以追加方式位于可复用请求前缀之后。
+
+## 已知限制与延后工作
+
+- 操作面向 UTF-8 文本，不支持二进制文件。
+- `str_replace` 刻意拒绝零匹配或多匹配，且没有 `replace_all` 参数。
+- 每个修改操作都会经过 `fs/write-intent` 或 `fs/edit-intent`，解析当前 session 的沙箱策略，并交由挂载的文件系统与策略插件执行。

packages/fs/tool-str-replace-editor/package.json

@@ -0,0 +1,54 @@
+{
+  "name": "@deepseek-ai/dsh-tool-str-replace-editor",
+  "description": "Model-facing view, create, literal replace, and line insert tool over the Harness filesystem service",
+  "version": "0.0.1",
+  "private": true,
+  "type": "module",
+  "main": "lib/index.js",
+  "types": "lib/types/index.d.ts",
+  "exports": {
+    ".": {
+      "types": "./lib/types/index.d.ts",
+      "default": "./lib/index.js"
+    },
+    "./invariant": {
+      "types": "./lib/types/invariant.d.ts",
+      "default": "./lib/invariant.js"
+    },
+    "./package.json": "./package.json"
+  },
+  "files": [
+    "lib/index.js",
+    "lib/invariant.js",
+    "lib/types/**/*.d.ts",
+    "lib/types/**/*.d.ts.map",
+    "src"
+  ],
+  "license": "BSD-3-Clause",
+  "peerDependencies": {
+    "@deepseek-ai/dsh-fs": "^0.0.1",
+    "@deepseek-ai/dsh-invariants": "^0.0.1",
+    "@deepseek-ai/dsh-sandbox": "^0.0.1",
+    "@deepseek-ai/dsh-sandbox-policy": "^0.0.1",
+    "@deepseek-ai/dsh-tools": "^0.0.1",
+    "cordis": "^4.0.0-rc.7"
+  },
+  "dependencies": {
+    "schemastery": "^3.18.0"
+  },
+  "devDependencies": {
+    "@deepseek-ai/dsh-agent": "workspace:^",
+    "@deepseek-ai/dsh-fs": "workspace:^",
+    "@deepseek-ai/dsh-fs-local": "workspace:^",
+    "@deepseek-ai/dsh-fs-policy": "workspace:^",
+    "@deepseek-ai/dsh-fs-sandbox": "workspace:^",
+    "@deepseek-ai/dsh-invariants": "workspace:^",
+    "@deepseek-ai/dsh-llm": "workspace:^",
+    "@deepseek-ai/dsh-sandbox": "workspace:^",
+    "@deepseek-ai/dsh-sandbox-policy": "workspace:^",
+    "@deepseek-ai/dsh-session": "workspace:^",
+    "@deepseek-ai/dsh-system-prompt": "workspace:^",
+    "@deepseek-ai/dsh-tools": "workspace:^",
+    "cordis": "^4.0.0-rc.7"
+  }
+}

packages/fs/tool-str-replace-editor/src/index.ts

@@ -0,0 +1,522 @@
+/**
+ * Model-facing `str_replace_editor` over the Harness filesystem seam.
+ * @module @deepseek-ai/dsh-tool-str-replace-editor
+ */
+
+import { isAbsolute } from 'node:path'
+import type { Context } from 'cordis'
+import z from 'schemastery'
+import { FsError } from '@deepseek-ai/dsh-fs'
+import type { FsInfo, FsTarget, FsWriteIntent } from '@deepseek-ai/dsh-fs'
+import { sandboxDenialMarker } from '@deepseek-ai/dsh-sandbox'
+import type { SandboxExecutionPolicy } from '@deepseek-ai/dsh-sandbox'
+import type { SandboxPolicyService } from '@deepseek-ai/dsh-sandbox-policy'
+import { defineTool } from '@deepseek-ai/dsh-tools'
+import type { ToolCallView, ToolRunContext } from '@deepseek-ai/dsh-tools'
+
+const TRUNCATED_MESSAGE = '<response clipped><NOTE>To save on context only part of this file has been shown to you. You should retry this tool after you have searched inside the file with `grep -n` in order to find the line numbers of what you are looking for.</NOTE>'
+
+const DEFAULT_DESCRIPTION = `
+Custom editing tool for viewing, creating and editing files
+* State is persistent across command calls and discussions with the user
+* If \`path\` is a file, \`view\` displays the result of applying \`cat -n\`. If \`path\` is a directory, \`view\` lists non-hidden files and directories up to 2 levels deep
+* The \`create\` command cannot be used if the specified \`path\` already exists as a file
+* If a \`command\` generates a long output, it will be truncated and marked with \`<response clipped>\`
+
+Notes for using the \`str_replace\` command:
+* The \`old_str\` parameter should match EXACTLY one or more consecutive lines from the original file. Be mindful of whitespaces!
+* If the \`old_str\` parameter is not unique in the file, the replacement will not be performed. Make sure to include enough context in \`old_str\` to make it unique
+* The \`new_str\` parameter should contain the edited lines that should replace the \`old_str\`
+`.trim()
+
+function maybeTruncate(content: string, maxOutputChars: number): string {
+  return content.length <= maxOutputChars
+    ? content
+    : content.slice(0, maxOutputChars) + TRUNCATED_MESSAGE
+}
+
+function codepointCompare(left: string, right: string): number {
+  return left < right ? -1 : left > right ? 1 : 0
+}
+
+function matchOffsets(content: string, search: string): number[] {
+  const offsets: number[] = []
+  let offset = 0
+  while (true) {
+    const match = content.indexOf(search, offset)
+    if (match < 0) return offsets
+    offsets.push(match)
+    offset = match + search.length
+  }
+}
+
+function lineNumbersAt(content: string, offsets: readonly number[]): number[] {
+  let line = 1
+  let cursor = 0
+  return offsets.map((offset) => {
+    while (cursor < offset) {
+      if (content[cursor] === '\n') line += 1
+      cursor += 1
+    }
+    return line
+  })
+}
+
+class MutationPolicy {
+  private readonly policy: SandboxPolicyService | undefined
+
+  constructor(ctx: Context) {
+    this.policy = ctx.fs.sandboxMode === undefined ? undefined : ctx.get('sandboxPolicy')
+    if (ctx.fs.sandboxMode !== undefined && this.policy === undefined) {
+      throw new Error('tool-str-replace-editor: the mounted filesystem confines but ctx.sandboxPolicy is missing')
+    }
+  }
+
+  resolve(exec: ToolRunContext): SandboxExecutionPolicy | undefined {
+    return this.policy?.resolve({
+      ...exec.agent === undefined ? {} : { session: exec.agent.session },
+    })
+  }
+
+  mapError(error: unknown, policy: SandboxExecutionPolicy | undefined): unknown {
+    if (!(error instanceof FsError) || error.code !== 'FS_SANDBOX_DENIED') return error
+    const mode = (policy as SandboxExecutionPolicy).mode
+    return new FsError(sandboxDenialMarker(mode), 'FS_SANDBOX_DENIED', { cause: error })
+  }
+}
+
+async function resolveTarget(
+  ctx: Context,
+  path: string,
+  signal: AbortSignal,
+): Promise<FsTarget> {
+  if (path.trim().length === 0) throw new Error('path must be a non-empty string')
+  if (!isAbsolute(path)) {
+    throw new Error(`The path ${path} is not an absolute path, it should start with \`/\`. Maybe you meant /${path}?`)
+  }
+  return ctx.fs.resolve(path, { signal })
+}
+
+async function statExisting(
+  ctx: Context,
+  target: FsTarget,
+  command: 'view' | 'str_replace' | 'insert',
+  exec: ToolRunContext,
+): Promise<FsInfo> {
+  const info = await ctx.fs.stat(target, exec.signal)
+  if (info === undefined) {
+    throw new FsError(
+      `The path ${target.displayPath} does not exist. Please provide a valid path.`,
+      'FS_NOT_FOUND',
+    )
+  }
+  if (info.type === 'directory' && command !== 'view') {
+    throw new FsError(
+      `The path ${target.displayPath} is a directory and only the \`view\` command can be used on directories`,
+      'FS_NOT_REGULAR_FILE',
+    )
+  }
+  return info
+}
+
+function requiredForCommand(
+  value: string | undefined,
+  parameter: string,
+  command: string,
+  allowEmpty = true,
+): string {
+  if (value === undefined) throw new Error(`Parameter \`${parameter}\` is required for command: ${command}`)
+  if (!allowEmpty && value.length === 0) {
+    throw new Error(`Parameter \`${parameter}\` is empty for command: ${command}`)
+  }
+  return value
+}
+
+function formatFileView(
+  path: string,
+  content: string,
+  maxOutputChars: number,
+  viewRange?: number[],
+): string {
+  const allLines = content.split('\n')
+  let lines = allLines
+  let initialLine = 1
+  let finalLine: number | undefined
+  let prompt = `Here's the content of ${path} with line numbers (which has a total of ${allLines.length} lines)`
+  if (viewRange !== undefined) {
+    const [requestedInitialLine, requestedFinalLine] = viewRange
+    if (
+      viewRange.length !== 2
+      || requestedInitialLine === undefined
+      || requestedFinalLine === undefined
+      || !viewRange.every(Number.isInteger)
+    ) {
+      throw new Error('Invalid `view_range`. It should be a list of two integers.')
+    }
+    initialLine = requestedInitialLine
+    finalLine = requestedFinalLine
+    if (initialLine < 1 || initialLine > allLines.length) {
+      throw new Error(
+        `Invalid \`view_range\`: [${viewRange.join(', ')}]. Its first element \`${initialLine}\` should be within the range of lines of the file: [1, ${allLines.length}]`,
+      )
+    }
+    if (finalLine > allLines.length) {
+      throw new Error(
+        `Invalid \`view_range\`: [${viewRange.join(', ')}]. Its second element \`${finalLine}\` should be smaller than the number of lines in the file: \`${allLines.length}\``,
+      )
+    }
+    if (finalLine !== -1 && finalLine < initialLine) {
+      throw new Error(
+        `Invalid \`view_range\`: [${viewRange.join(', ')}]. Its second element \`${finalLine}\` should be larger or equal than its first \`${initialLine}\``,
+      )
+    }
+    lines = finalLine === -1
+      ? allLines.slice(initialLine - 1)
+      : allLines.slice(initialLine - 1, finalLine)
+    prompt += ` with view_range=[${initialLine}, ${finalLine}]`
+  }
+  const numbered = lines
+    .map((line, index) => `${String(initialLine + index).padStart(6, ' ')}  ${line}`)
+    .join('\n')
+  return maybeTruncate(`${prompt}:\n${numbered}\n`, maxOutputChars)
+}
+
+async function listDirectory(
+  ctx: Context,
+  target: FsTarget,
+  maxOutputChars: number,
+  exec: ToolRunContext,
+): Promise<string> {
+  async function visit(dir: FsTarget, depth: number): Promise<string[]> {
+    const entries = await ctx.fs.listDir(dir, exec.signal)
+    const rows: string[] = []
+    for (const entry of entries.filter(candidate =>
+      !candidate.name.startsWith('.')
+      && candidate.name !== 'node_modules'
+      && candidate.name !== '__pycache__')) {
+      const type = entry.type === 'directory' ? 'd' : entry.type === 'file' ? 'f' : '?'
+      rows.push(`${type}\t${entry.target.displayPath}`)
+      if (entry.type === 'directory' && depth < 2) {
+        rows.push(...await visit(entry.target, depth + 1))
+      }
+    }
+    return rows
+  }
+  const rows = [`d\t${target.displayPath}`, ...await visit(target, 1)]
+  rows.sort((left, right) => {
+    const leftPath = left.slice(left.indexOf('\t') + 1)
+    const rightPath = right.slice(right.indexOf('\t') + 1)
+    return codepointCompare(leftPath, rightPath)
+  })
+  const listing = maybeTruncate(rows.join('\n') + '\n', maxOutputChars)
+  return `Here're the files and directories up to 2 levels deep in ${target.displayPath}, excluding hidden items, node_modules, and Python cache directories:\n${listing}\n`
+}
+
+async function viewPath(
+  ctx: Context,
+  path: string,
+  viewRange: number[] | undefined,
+  maxOutputChars: number,
+  exec: ToolRunContext,
+): Promise<string> {
+  const target = await resolveTarget(ctx, path, exec.signal)
+  const info = await statExisting(ctx, target, 'view', exec)
+  if (info.type === 'directory') {
+    if (viewRange !== undefined) {
+      throw new Error('The `view_range` parameter is not allowed when `path` points to a directory.')
+    }
+    return listDirectory(ctx, target, maxOutputChars, exec)
+  }
+  if (info.type !== 'file') {
+    throw new FsError(`cannot view "${target.displayPath}": not a regular file or directory`, 'FS_NOT_REGULAR_FILE')
+  }
+  const content = await ctx.fs.readText(target, exec.signal)
+  ctx.emit('fs/observed', target, info.version, exec)
+  return formatFileView(target.displayPath, content, maxOutputChars, viewRange)
+}
+
+async function createFile(
+  ctx: Context,
+  policy: MutationPolicy,
+  path: string,
+  fileText: string | undefined,
+  exec: ToolRunContext,
+): Promise<string> {
+  const content = requiredForCommand(fileText, 'file_text', 'create')
+  const sandboxPolicy = policy.resolve(exec)
+  const target = await resolveTarget(ctx, path, exec.signal)
+  if (await ctx.fs.stat(target, exec.signal) !== undefined) {
+    throw new Error(`File already exists at: ${target.displayPath}. Cannot overwrite files using command \`create\`.`)
+  }
+  const intent = await ctx.waterfall(
+    'fs/write-intent',
+    target,
+    exec,
+    () => ({ kind: 'createIfAbsent' } as const),
+  )
+  let outcome
+  try {
+    outcome = await ctx.fs.writeText(
+      target,
+      content,
+      intent,
+      exec.signal,
+      sandboxPolicy,
+    )
+  } catch (error: unknown) {
+    throw policy.mapError(error, sandboxPolicy)
+  }
+  ctx.emit('fs/observed', target, outcome.version, exec)
+  return `New file created successfully at: ${target.displayPath}`
+}
+
+async function replaceInFile(
+  ctx: Context,
+  policy: MutationPolicy,
+  path: string,
+  oldStr: string | undefined,
+  newStr: string | undefined,
+  exec: ToolRunContext,
+): Promise<string> {
+  const sandboxPolicy = policy.resolve(exec)
+  const target = await resolveTarget(ctx, path, exec.signal)
+  const intent = await ctx.waterfall('fs/edit-intent', target, exec, () => undefined)
+  const oldValue = requiredForCommand(oldStr, 'old_str', 'str_replace', false)
+  const newValue = newStr ?? ''
+  const info = await statExisting(ctx, target, 'str_replace', exec)
+  if (info.type !== 'file') {
+    throw new FsError(`cannot edit "${target.displayPath}": not a regular file`, 'FS_NOT_REGULAR_FILE')
+  }
+  const before = await ctx.fs.readText(target, exec.signal)
+  const offsets = matchOffsets(before, oldValue)
+  const offset = offsets[0]
+  if (offset === undefined) {
+    throw new FsError(
+      `No replacement was performed, old_str \`${oldValue}\` did not appear verbatim in ${target.displayPath}.`,
+      'FS_EDIT_NOT_FOUND',
+    )
+  }
+  if (offsets.length > 1) {
+    const lines = lineNumbersAt(before, offsets)
+    throw new FsError(
+      `No replacement was performed. Multiple occurrences of old_str \`${oldValue}\` in lines [${lines.join(', ')}]. Please ensure it is unique`,
+      'FS_AMBIGUOUS_EDIT',
+    )
+  }
+  let outcome
+  try {
+    outcome = await ctx.fs.writeText(
+      target,
+      before.slice(0, offset) + newValue + before.slice(offset + oldValue.length),
+      intent === undefined
+        ? { kind: 'replaceIfVersion', version: info.version }
+        : { kind: 'replaceIfVersion', version: intent.version },
+      exec.signal,
+      sandboxPolicy,
+    )
+  } catch (error: unknown) {
+    throw policy.mapError(error, sandboxPolicy)
+  }
+  ctx.emit('fs/observed', target, outcome.version, exec)
+  return `The file ${target.displayPath} has been edited successfully.`
+}
+
+async function insertInFile(
+  ctx: Context,
+  policy: MutationPolicy,
+  path: string,
+  insertLine: number | undefined,
+  newStr: string | undefined,
+  exec: ToolRunContext,
+): Promise<string> {
+  if (insertLine === undefined) throw new Error('Parameter `insert_line` is required for command: insert')
+  const value = requiredForCommand(newStr, 'new_str', 'insert')
+  const sandboxPolicy = policy.resolve(exec)
+  const target = await resolveTarget(ctx, path, exec.signal)
+  const intent = await ctx.waterfall('fs/edit-intent', target, exec, () => undefined)
+  const info = await statExisting(ctx, target, 'insert', exec)
+  if (info.type !== 'file') {
+    throw new FsError(`cannot insert into "${target.displayPath}": not a regular file`, 'FS_NOT_REGULAR_FILE')
+  }
+  const before = await ctx.fs.readText(target, exec.signal)
+  const lines = before.split('\n')
+  if (!Number.isInteger(insertLine) || insertLine < 0 || insertLine > lines.length) {
+    throw new Error(
+      `Invalid \`insert_line\` parameter: ${insertLine}. It should be within the range of lines of the file: [0, ${lines.length}]`,
+    )
+  }
+  const after = [
+    ...lines.slice(0, insertLine),
+    ...value.split('\n'),
+    ...lines.slice(insertLine),
+  ].join('\n')
+  const expected: FsWriteIntent = intent === undefined
+    ? { kind: 'replaceIfVersion', version: info.version }
+    : { kind: 'replaceIfVersion', version: intent.version }
+  let outcome
+  try {
+    outcome = await ctx.fs.writeText(target, after, expected, exec.signal, sandboxPolicy)
+  } catch (error: unknown) {
+    throw policy.mapError(error, sandboxPolicy)
+  }
+  ctx.emit('fs/observed', target, outcome.version, exec)
+  return `The file ${target.displayPath} has been edited successfully.`
+}
+
+interface ResolvedConfig {
+  maxOutputChars: number
+  description: string
+}
+
+function presentEditorCall(args: {
+  command: 'view' | 'create' | 'str_replace' | 'insert'
+  path: string
+  file_text?: string
+  insert_line?: number
+  new_str?: string
+  old_str?: string
+}): ToolCallView {
+  switch (args.command) {
+    case 'view':
+      return {
+        card: 'generic',
+        title: `view ${args.path}`,
+        kind: 'read',
+        locations: [{ path: args.path }],
+      }
+    case 'create':
+      return {
+        card: 'diff',
+        title: `create ${args.path}`,
+        diffs: [{ path: args.path, oldText: null, newText: args.file_text ?? '' }],
+        locations: [{ path: args.path }],
+      }
+    case 'str_replace':
+      return {
+        card: 'diff',
+        title: `str_replace ${args.path}`,
+        diffs: [{
+          path: args.path,
+          oldText: args.old_str ?? null,
+          newText: args.new_str ?? '',
+        }],
+        locations: [{ path: args.path }],
+      }
+    case 'insert':
+      return {
+        card: 'generic',
+        title: `insert ${args.path}`,
+        kind: 'edit',
+        locations: [{
+          path: args.path,
+          ...args.insert_line === undefined ? {} : { line: Math.max(1, args.insert_line + 1) },
+        }],
+      }
+  }
+}
+
+/** Register the model-facing `str_replace_editor` tool. */
+function registerStrReplaceEditor(ctx: Context, config: ResolvedConfig): void {
+  const policy = new MutationPolicy(ctx)
+  ctx.tools.register(defineTool({
+    name: 'str_replace_editor',
+    description: config.description,
+    parameters: {
+      command: {
+        type: 'string',
+        required: true,
+        enum: ['view', 'create', 'str_replace', 'insert'],
+        description: 'The commands to run. Allowed options are: `view`, `create`, `str_replace`, `insert`.',
+      },
+      path: {
+        type: 'string',
+        required: true,
+        description: 'Absolute path to file or directory, e.g. `/repo/file.py` or `/repo`.',
+      },
+      file_text: {
+        type: 'string',
+        description: 'Required parameter of `create` command, with the content of the file to be created.',
+      },
+      insert_line: {
+        type: 'integer',
+        description: 'Required parameter of `insert` command. The `new_str` will be inserted AFTER the line `insert_line` of `path`.',
+      },
+      new_str: {
+        type: 'string',
+        description: 'Optional parameter of `str_replace` command containing the new string (if not given, no string will be added). Required parameter of `insert` command containing the string to insert.',
+      },
+      old_str: {
+        type: 'string',
+        description: 'Required parameter of `str_replace` command containing the string in `path` to replace.',
+      },
+      view_range: {
+        type: 'array',
+        items: { type: 'integer' },
+        description: 'Optional parameter of `view` command when `path` points to a file. If none is given, the full file is shown. If provided, the file will be shown in the indicated line number range, e.g. [11, 12] will show lines 11 and 12. Indexing at 1 to start. Setting `[start_line, -1]` shows all lines from `start_line` to the end of the file.',
+      },
+    },
+    output: {
+      schema: { type: 'string' },
+      render: (_args, value) => [{ type: 'text', text: value }],
+    },
+    async execute(args, exec) {
+      switch (args.command) {
+        case 'view':
+          return viewPath(ctx, args.path, args.view_range, config.maxOutputChars, exec)
+        case 'create':
+          return createFile(ctx, policy, args.path, args.file_text, exec)
+        case 'str_replace':
+          return replaceInFile(
+            ctx,
+            policy,
+            args.path,
+            args.old_str,
+            args.new_str,
+            exec,
+          )
+        case 'insert':
+          return insertInFile(
+            ctx,
+            policy,
+            args.path,
+            args.insert_line,
+            args.new_str,
+            exec,
+          )
+      }
+    },
+    presentCall: presentEditorCall,
+  }))
+}
+
+export const name = 'tool-str-replace-editor'
+export const inject = ['tools', 'fs']
+
+/** Configuration for the string-replacement editor tool. */
+export interface Config {
+  /** Maximum returned view characters before clipping (default 16000). */
+  maxOutputChars?: number
+  /** Model-facing tool description. */
+  description?: string
+}
+
+/** Runtime configuration schema for the string-replacement editor tool. */
+export const Config: z<Config> = z.object({
+  maxOutputChars: z.number().default(16_000),
+  description: z.string().default(DEFAULT_DESCRIPTION),
+})
+
+/** Register one `str_replace_editor` tool over `ctx.fs`. */
+export function apply(ctx: Context, config: Config): void {
+  const resolved: ResolvedConfig = {
+    maxOutputChars: config.maxOutputChars ?? 16_000,
+    description: config.description ?? DEFAULT_DESCRIPTION,
+  }
+  if (!Number.isSafeInteger(resolved.maxOutputChars) || resolved.maxOutputChars <= 0) {
+    throw new Error('tool-str-replace-editor: maxOutputChars must be a positive safe integer')
+  }
+  if (resolved.description.trim().length === 0) {
+    throw new Error('tool-str-replace-editor: description must be non-empty')
+  }
+  registerStrReplaceEditor(ctx, resolved)
+}

packages/fs/tool-str-replace-editor/src/invariant.ts

@@ -0,0 +1,30 @@
+/**
+ * Package-owned invariant companion for `@deepseek-ai/dsh-tool-str-replace-editor`.
+ * @module @deepseek-ai/dsh-tool-str-replace-editor/invariant
+ */
+
+/* jscpd:ignore-start */
+import type { Context } from 'cordis'
+import type { InvariantInstaller } from '@deepseek-ai/dsh-invariants'
+
+const PACKAGE_NAME = '@deepseek-ai/dsh-tool-str-replace-editor'
+
+/** Cordis companion plugin name. */
+export const name = 'tool-str-replace-editor-invariant'
+/** Service required before the companion can reserve package ownership. */
+export const inject = ['invariants']
+
+/**
+ * No runtime invariant: the tool adapter owns no independent durable state;
+ * filesystem mutation relations stay with the provider and policy plugins.
+ */
+const install: InvariantInstaller = () => {}
+
+/**
+ * Register this package's invariant companion.
+ * @param ctx - Cordis context carrying the invariant service.
+ * @returns the installed registration's disposer after setup succeeds.
+ */
+export const apply = (ctx: Context): Promise<() => void> =>
+  Promise.resolve(ctx.invariants.register(PACKAGE_NAME, install))
+/* jscpd:ignore-end */

packages/fs/tool-str-replace-editor/tests/tools.spec.ts

@@ -0,0 +1,547 @@
+import { mkdtemp, mkdir, readFile, rm, writeFile } from 'node:fs/promises'
+import { tmpdir } from 'node:os'
+import { join } from 'node:path'
+import { afterEach, describe, expect, it } from 'vitest'
+import { Context } from 'cordis'
+import { FsVersion } from '@deepseek-ai/dsh-fs'
+import { CallId } from '@deepseek-ai/dsh-llm'
+import { Session, SessionId } from '@deepseek-ai/dsh-session'
+import AgentRegistry from '@deepseek-ai/dsh-agent'
+import type { Agent } from '@deepseek-ai/dsh-agent'
+import LocalFileSystem from '@deepseek-ai/dsh-fs-local'
+import * as FsPolicy from '@deepseek-ai/dsh-fs-policy'
+import SandboxedFileSystem from '@deepseek-ai/dsh-fs-sandbox'
+import SandboxPolicy from '@deepseek-ai/dsh-sandbox-policy'
+import SystemPrompt from '@deepseek-ai/dsh-system-prompt'
+import ToolRegistry from '@deepseek-ai/dsh-tools'
+import * as ToolStrReplaceEditor from '@deepseek-ai/dsh-tool-str-replace-editor'
+
+const contexts: Context[] = []
+const roots: string[] = []
+let callNumber = 0
+
+afterEach(async () => {
+  for (const ctx of contexts.splice(0)) await ctx.fiber.dispose()
+  for (const root of roots.splice(0)) await rm(root, { recursive: true, force: true })
+})
+
+function agent(ctx: Context, cwd: string): Agent {
+  const id = SessionId(`str-replace-editor-owner-${callNumber}`)
+  const scope = ctx.plugin(() => {})
+  const value: Agent = {
+    id,
+    options: {},
+    session: new Session(id, [], { version: 0, id, createdAt: 0, cwd }),
+    status: 'idle',
+    acceptsNextStep: false,
+    ctx: scope.ctx,
+    followup: () => {},
+    steer: () => {},
+    inject: () => {},
+    send: () => {},
+    updateInbox: () => 'not-found',
+    cancel() {},
+    whenIdle: () => Promise.resolve(),
+  }
+  ctx.agents.register(value)
+  return value
+}
+
+function text(result: { content: { type: string; text?: string }[] }): string {
+  return result.content.filter(block => block.type === 'text').map(block => block.text).join('')
+}
+
+function call(ctx: Context, owner: Agent | undefined, args: unknown) {
+  return ctx.tools.execute({
+    signal: new AbortController().signal,
+    callId: CallId(`str-replace-editor-${++callNumber}`),
+    name: 'str_replace_editor',
+    arguments: args,
+    ...owner === undefined ? {} : { agent: owner },
+  })
+}
+
+async function setup(
+  config: ToolStrReplaceEditor.Config = {},
+  options: { fsPolicy?: boolean; sandboxMode?: 'read-only' | 'workspace-write' | 'danger-full-access' } = {},
+) {
+  const root = await mkdtemp(join(tmpdir(), 'dsh-tool-str-replace-editor-'))
+  roots.push(root)
+  const ctx = new Context()
+  contexts.push(ctx)
+  await ctx.plugin(SystemPrompt)
+  await ctx.plugin(ToolRegistry)
+  await ctx.plugin(AgentRegistry)
+  if (options.sandboxMode === undefined) {
+    await ctx.plugin(LocalFileSystem, { cwd: root })
+  } else {
+    await ctx.plugin(SandboxPolicy, { mode: options.sandboxMode, workspaceRoot: root })
+    await ctx.plugin(SandboxedFileSystem, { cwd: root })
+  }
+  if (options.fsPolicy === true) await ctx.plugin(FsPolicy)
+  const fiber = await ctx.plugin(ToolStrReplaceEditor, config)
+  return { ctx, root, fiber, owner: agent(ctx, root) }
+}
+
+describe('tool-str-replace-editor', () => {
+  it('registers the standalone schema and configurable description', async () => {
+    const { ctx, fiber } = await setup({ description: 'custom editor description' })
+    const schema = ctx.tools.schemas()[0]
+    expect(ctx.tools.schemas().map(item => item.name)).toEqual(['str_replace_editor'])
+    expect(schema?.description).toBe('custom editor description')
+    const properties = (schema?.parameters as {
+      properties: Record<string, { type?: string; items?: { type?: string } }>
+    }).properties
+    expect(properties).not.toHaveProperty('replace_all')
+    expect(properties.insert_line?.type).toBe('integer')
+    expect(properties.view_range?.items?.type).toBe('integer')
+    expect(ctx.tools.get('str_replace_editor')?.presentCall?.({
+      command: 'view',
+      path: '/workspace/a.txt',
+    })).toMatchObject({
+      card: 'generic',
+      kind: 'read',
+      locations: [{ path: '/workspace/a.txt' }],
+    })
+    expect(ctx.tools.get('str_replace_editor')?.presentCall?.({
+      command: 'create',
+      path: '/workspace/a.txt',
+      file_text: 'hello',
+    })).toMatchObject({
+      card: 'diff',
+      diffs: [{ path: '/workspace/a.txt', oldText: null, newText: 'hello' }],
+    })
+    expect(ctx.tools.get('str_replace_editor')?.presentCall?.({
+      command: 'str_replace',
+      path: '/workspace/a.txt',
+      old_str: 'old',
+      new_str: 'new',
+    })).toMatchObject({
+      card: 'diff',
+      diffs: [{ path: '/workspace/a.txt', oldText: 'old', newText: 'new' }],
+    })
+    expect(ctx.tools.get('str_replace_editor')?.presentCall?.({
+      command: 'insert',
+      path: '/workspace/a.txt',
+      insert_line: 0,
+      new_str: 'x',
+    })).toMatchObject({
+      card: 'generic',
+      kind: 'edit',
+      locations: [{ path: '/workspace/a.txt', line: 1 }],
+    })
+    expect(ctx.tools.get('str_replace_editor')?.presentCall?.({
+      command: 'create',
+      path: '/workspace/empty.txt',
+    })).toMatchObject({
+      diffs: [{ path: '/workspace/empty.txt', oldText: null, newText: '' }],
+    })
+    expect(ctx.tools.get('str_replace_editor')?.presentCall?.({
+      command: 'str_replace',
+      path: '/workspace/a.txt',
+    })).toMatchObject({
+      diffs: [{ path: '/workspace/a.txt', oldText: null, newText: '' }],
+    })
+    expect(ctx.tools.get('str_replace_editor')?.presentCall?.({
+      command: 'insert',
+      path: '/workspace/a.txt',
+    })).toMatchObject({
+      locations: [{ path: '/workspace/a.txt' }],
+    })
+
+    await fiber.dispose()
+    expect(ctx.tools.schemas()).toEqual([])
+    expect(ctx.tools.get('str_replace_editor')).toBeUndefined()
+  })
+
+  it('creates, views, replaces, and inserts with the canonical model-facing output', async () => {
+    const { ctx, root, owner } = await setup()
+    const sample = join(root, 'sample.txt')
+    expect(text(await call(ctx, owner, {
+      command: 'create',
+      path: sample,
+      file_text: 'one\ntwo\nthree\n',
+    }))).toBe(`New file created successfully at: ${sample}`)
+
+    expect(text(await call(ctx, owner, {
+      command: 'view',
+      path: sample,
+      view_range: [2, -1],
+    }))).toBe([
+      `Here's the content of ${sample} with line numbers (which has a total of 4 lines) with view_range=[2, -1]:`,
+      '     2  two',
+      '     3  three',
+      '     4  ',
+      '',
+    ].join('\n'))
+
+    expect(text(await call(ctx, owner, {
+      command: 'str_replace',
+      path: sample,
+      old_str: 'two',
+      new_str: 'TWO',
+    }))).toBe(`The file ${sample} has been edited successfully.`)
+    expect(text(await call(ctx, owner, {
+      command: 'str_replace',
+      path: sample,
+      old_str: 'TWO',
+    }))).toBe(`The file ${sample} has been edited successfully.`)
+    expect(text(await call(ctx, owner, {
+      command: 'insert',
+      path: sample,
+      insert_line: 1,
+      new_str: 'between',
+    }))).toBe(`The file ${sample} has been edited successfully.`)
+    expect(await readFile(sample, 'utf8')).toBe('one\nbetween\n\nthree\n')
+  })
+
+  it('writes replacement text literally', async () => {
+    const { ctx, root, owner } = await setup()
+    const sample = join(root, 'literal.txt')
+    const replacement = "$&|$`|$'|$$"
+    await writeFile(sample, 'before OLD after')
+
+    expect((await call(ctx, owner, {
+      command: 'str_replace',
+      path: sample,
+      old_str: 'OLD',
+      new_str: replacement,
+    })).isError).toBe(false)
+    expect(await readFile(sample, 'utf8')).toBe(`before ${replacement} after`)
+  })
+
+  it('lists visible entries to depth two and clips at the configured view limit', async () => {
+    const { ctx, root, owner } = await setup({ maxOutputChars: 10_000 })
+    await mkdir(join(root, 'dir', 'nested', 'third'), { recursive: true })
+    await mkdir(join(root, 'dir', 'node_modules', 'pkg'), { recursive: true })
+    await mkdir(join(root, 'dir', 'node_modules_old'), { recursive: true })
+    await mkdir(join(root, 'dir', '__pycache__'), { recursive: true })
+    await mkdir(join(root, 'dir', '__pycache__backup'), { recursive: true })
+    await writeFile(join(root, 'dir', 'visible.txt'), 'ok')
+    await writeFile(join(root, 'dir', '.hidden'), 'hidden')
+    await writeFile(join(root, 'dir', 'nested', 'child.txt'), 'child')
+    await writeFile(join(root, 'dir', 'nested', 'third', 'too-deep.txt'), 'deep')
+    await writeFile(join(root, 'dir', 'node_modules', 'pkg', 'index.js'), 'hidden dependency')
+    await writeFile(join(root, 'dir', 'node_modules_old', 'kept.js'), 'visible source')
+    await writeFile(join(root, 'dir', '__pycache__', 'module.pyc'), 'cache')
+    await writeFile(join(root, 'dir', '__pycache__backup', 'kept.py'), 'visible source')
+    const listDir = ctx.fs.listDir.bind(ctx.fs)
+    const otherTarget = await ctx.fs.resolve(join(root, 'dir', 'other'))
+    ctx.fs.listDir = async (target, signal) => {
+      const entries = await listDir(target, signal)
+      return target.displayPath === join(root, 'dir')
+        ? [
+          { name: 'same-target', type: 'other', target: otherTarget },
+          { name: 'other', type: 'other', target: otherTarget },
+          ...entries.toReversed(),
+        ]
+        : entries
+    }
+
+    const listing = text(await call(ctx, owner, { command: 'view', path: join(root, 'dir') }))
+    expect(listing).not.toContain('.hidden')
+    expect(listing).not.toContain('too-deep.txt')
+    expect(listing).not.toContain('index.js')
+    expect(listing).not.toContain('module.pyc')
+    expect(listing).toContain('node_modules_old/kept.js')
+    expect(listing).toContain('__pycache__backup/kept.py')
+
+    const clipped = await setup({ maxOutputChars: 10 })
+    await writeFile(join(clipped.root, 'large.txt'), 'x'.repeat(100))
+    expect(text(await call(clipped.ctx, clipped.owner, {
+      command: 'view',
+      path: join(clipped.root, 'large.txt'),
+    })))
+      .toContain('<response clipped>')
+  })
+
+  it('matches canonical empty-line, range, and end-insert behavior', async () => {
+    const { ctx, root, owner } = await setup()
+    const empty = join(root, 'empty.txt')
+    const newline = join(root, 'newline.txt')
+    const plain = join(root, 'plain.txt')
+    await writeFile(empty, '')
+    await writeFile(newline, '\n')
+    await writeFile(plain, 'one\ntwo')
+
+    expect(text(await call(ctx, owner, { command: 'view', path: empty })))
+      .toContain('(which has a total of 1 lines):\n     1  \n')
+    expect(text(await call(ctx, owner, { command: 'view', path: newline })))
+      .toContain('(which has a total of 2 lines):\n     1  \n     2  \n')
+    expect(text(await call(ctx, owner, {
+      command: 'view',
+      path: plain,
+      view_range: [1, 2],
+    }))).toContain('     2  two')
+    expect(text(await call(ctx, undefined, {
+      command: 'view',
+      path: plain,
+    }))).toContain('     1  one')
+    expect((await call(ctx, undefined, {
+      command: 'create',
+      path: join(root, 'ownerless.txt'),
+      file_text: 'ownerless',
+    })).isError).toBe(false)
+
+    await call(ctx, owner, {
+      command: 'insert',
+      path: plain,
+      insert_line: 2,
+      new_str: 'three',
+    })
+    expect(await readFile(plain, 'utf8')).toBe('one\ntwo\nthree')
+
+    await writeFile(newline, 'one\n')
+    await call(ctx, owner, {
+      command: 'insert',
+      path: newline,
+      insert_line: 2,
+      new_str: 'three',
+    })
+    expect(await readFile(newline, 'utf8')).toBe('one\n\nthree')
+  })
+
+  it('uses old_str-only replacement failures and rejects relative paths', async () => {
+    const { ctx, root, owner } = await setup()
+    const ambiguous = join(root, 'ambiguous.txt')
+    await writeFile(ambiguous, 'same\nother\nsame')
+
+    const missing = await call(ctx, owner, {
+      command: 'str_replace',
+      path: ambiguous,
+      old_str: 'absent',
+      new_str: 'x',
+    })
+    expect(missing.isError).toBe(true)
+    expect(text(missing)).toContain(`old_str \`absent\` did not appear verbatim in ${ambiguous}`)
+    expect(text(missing)).not.toContain('old_string')
+
+    const repeated = await call(ctx, owner, {
+      command: 'str_replace',
+      path: ambiguous,
+      old_str: 'same',
+      new_str: 'x',
+    })
+    expect(repeated.isError).toBe(true)
+    expect(text(repeated)).toContain('Multiple occurrences of old_str `same` in lines [1, 3]')
+    expect(text(repeated)).not.toContain('replace_all')
+
+    await writeFile(ambiguous, 'alpha\nbeta\nmiddle\nalpha\nbeta')
+    const repeatedMultiline = await call(ctx, owner, {
+      command: 'str_replace',
+      path: ambiguous,
+      old_str: 'alpha\nbeta',
+      new_str: 'x',
+    })
+    expect(text(repeatedMultiline))
+      .toContain('Multiple occurrences of old_str `alpha\nbeta` in lines [1, 4]')
+
+    const mixedEol = join(root, 'mixed-eol.txt')
+    await writeFile(mixedEol, 'alpha\r\nbeta\nmiddle\nalpha\nbeta')
+    expect((await call(ctx, owner, {
+      command: 'str_replace',
+      path: mixedEol,
+      old_str: 'alpha\r\nbeta',
+      new_str: 'replaced',
+    })).isError).toBe(false)
+    expect(await readFile(mixedEol, 'utf8')).toBe('replaced\nmiddle\nalpha\nbeta')
+
+    const relative = await call(ctx, owner, { command: 'view', path: 'ambiguous.txt' })
+    expect(relative.isError).toBe(true)
+    expect(text(relative)).toContain('is not an absolute path')
+    expect(await readFile(ambiguous, 'utf8')).toBe('alpha\nbeta\nmiddle\nalpha\nbeta')
+  })
+
+  it('reports invalid commands or arguments without mutating files', async () => {
+    const { ctx, root, owner } = await setup()
+    const ambiguous = join(root, 'ambiguous.txt')
+    const empty = join(root, 'empty.txt')
+    const trailingNewline = join(root, 'trailing-newline.txt')
+    const threeLines = join(root, 'three-lines.txt')
+    const directory = join(root, 'directory')
+    await writeFile(ambiguous, 'same same')
+    await writeFile(empty, '')
+    await writeFile(trailingNewline, 'one\n')
+    await writeFile(threeLines, 'one\ntwo\nthree')
+    await mkdir(directory)
+
+    const cases = [
+      { command: 'view', path: '' },
+      { command: 'view', path: join(root, 'missing.txt') },
+      { command: 'view', path: ambiguous, view_range: [1] },
+      { command: 'view', path: ambiguous, view_range: [0, 1] },
+      { command: 'view', path: ambiguous, view_range: [1.5, 2] },
+      { command: 'view', path: threeLines, view_range: [1, 99] },
+      { command: 'view', path: threeLines, view_range: [2, 1] },
+      { command: 'view', path: directory, view_range: [1, 1] },
+      { command: 'create', path: join(root, 'new.txt') },
+      { command: 'create', path: ambiguous, file_text: 'overwrite' },
+      { command: 'str_replace', path: ambiguous, new_str: 'x' },
+      { command: 'str_replace', path: ambiguous, old_str: '', new_str: 'x' },
+      { command: 'insert', path: ambiguous, new_str: 'x' },
+      { command: 'insert', path: ambiguous, insert_line: -1, new_str: 'x' },
+      { command: 'insert', path: ambiguous, insert_line: 1.5, new_str: 'x' },
+      { command: 'insert', path: ambiguous, insert_line: 99, new_str: 'x' },
+      { command: 'insert', path: empty, insert_line: 2, new_str: 'x' },
+      { command: 'insert', path: directory, insert_line: 0, new_str: 'x' },
+    ]
+    for (const args of cases) {
+      expect((await call(ctx, owner, args)).isError).toBe(true)
+    }
+    expect(await readFile(ambiguous, 'utf8')).toBe('same same')
+
+    ctx.fs.stat = async () => ({ version: FsVersion('special'), type: 'other' })
+    const special = await call(ctx, owner, { command: 'view', path: join(root, 'special') })
+    expect(special.isError).toBe(true)
+    expect(special.error).toMatchObject({ info: { code: 'FS_NOT_REGULAR_FILE' } })
+    expect((await call(ctx, owner, {
+      command: 'str_replace',
+      path: join(root, 'special'),
+      old_str: 'x',
+      new_str: 'y',
+    })).error).toMatchObject({ info: { code: 'FS_NOT_REGULAR_FILE' } })
+    expect((await call(ctx, owner, {
+      command: 'insert',
+      path: join(root, 'special'),
+      insert_line: 0,
+      new_str: 'x',
+    })).error).toMatchObject({ info: { code: 'FS_NOT_REGULAR_FILE' } })
+  })
+
+  it('delegates read-before-edit decisions to fs-policy', async () => {
+    const { ctx, root, owner } = await setup({}, { fsPolicy: true })
+    const existing = join(root, 'existing.txt')
+    const created = join(root, 'created.txt')
+    await writeFile(existing, 'before')
+
+    const blindEdit = await call(ctx, owner, {
+      command: 'str_replace',
+      path: existing,
+      old_str: 'before',
+      new_str: 'after',
+    })
+    expect(blindEdit.error).toMatchObject({ info: { code: 'FS_NOT_OBSERVED' } })
+    expect(await readFile(existing, 'utf8')).toBe('before')
+
+    await call(ctx, owner, { command: 'view', path: existing })
+    expect((await call(ctx, owner, {
+      command: 'str_replace',
+      path: existing,
+      old_str: 'before',
+      new_str: 'after',
+    })).isError).toBe(false)
+    expect(await readFile(existing, 'utf8')).toBe('after')
+
+    expect((await call(ctx, owner, {
+      command: 'insert',
+      path: existing,
+      insert_line: 1,
+      new_str: 'tail',
+    })).isError).toBe(false)
+    expect(await readFile(existing, 'utf8')).toBe('after\ntail')
+
+    expect((await call(ctx, owner, {
+      command: 'create',
+      path: created,
+      file_text: 'new',
+    })).isError).toBe(false)
+    expect(await readFile(created, 'utf8')).toBe('new')
+  })
+
+  it('passes the session sandbox policy to every mutation', async () => {
+    const { ctx, root, owner } = await setup({}, { sandboxMode: 'read-only' })
+    const path = join(root, 'blocked.txt')
+    const result = await call(ctx, owner, {
+      command: 'create',
+      path,
+      file_text: 'blocked',
+    })
+    expect(result.error).toMatchObject({ info: { code: 'FS_SANDBOX_DENIED' } })
+    expect(text(result)).toContain('[sandbox: file access denied under read-only mode]')
+
+    const ownerless = await call(ctx, undefined, {
+      command: 'create',
+      path: join(root, 'ownerless-blocked.txt'),
+      file_text: 'blocked',
+    })
+    expect(ownerless.error).toMatchObject({ info: { code: 'FS_SANDBOX_DENIED' } })
+  })
+
+  it('preserves tabs outside the edited region', async () => {
+    const { ctx, root, owner } = await setup()
+    const path = join(root, 'Makefile')
+    await writeFile(path, 'target:\n\told\nremove\n')
+    expect(text(await call(ctx, owner, { command: 'view', path })))
+      .toContain('     2  \told')
+    await call(ctx, owner, {
+      command: 'str_replace',
+      path,
+      old_str: '\told',
+      new_str: '\tnew',
+    })
+    await call(ctx, owner, {
+      command: 'str_replace',
+      path,
+      old_str: 'remove\n',
+    })
+    await call(ctx, owner, {
+      command: 'insert',
+      path,
+      insert_line: 1,
+      new_str: '\tkept',
+    })
+    expect(await readFile(path, 'utf8')).toBe('target:\n\tkept\n\tnew\n')
+  })
+
+  it('reports missing sandbox-policy composition during plugin startup', async () => {
+    const root = await mkdtemp(join(tmpdir(), 'dsh-tool-str-replace-editor-missing-policy-'))
+    roots.push(root)
+    const ctx = new Context()
+    contexts.push(ctx)
+    await ctx.plugin(SystemPrompt)
+    await ctx.plugin(ToolRegistry)
+    await ctx.plugin(AgentRegistry)
+    await ctx.plugin(LocalFileSystem, { cwd: root })
+    Object.defineProperty(ctx.fs, 'sandboxMode', { value: 'read-only' })
+
+    await expect(ctx.plugin(ToolStrReplaceEditor))
+      .rejects.toThrow('the mounted filesystem confines but ctx.sandboxPolicy is missing')
+  })
+
+  it('maps unexpected backend write failures for replace and insert', async () => {
+    const { ctx, root, owner } = await setup()
+    const path = join(root, 'backend-error.txt')
+    await writeFile(path, 'old\n')
+    const failWrite = async (): Promise<never> => {
+      throw new Error('backend write failed')
+    }
+    ctx.fs.writeText = failWrite
+
+    const replace = await call(ctx, owner, {
+      command: 'str_replace',
+      path,
+      old_str: 'old',
+      new_str: 'new',
+    })
+    expect(replace.isError).toBe(true)
+    expect(text(replace)).toContain('backend write failed')
+
+    const insert = await call(ctx, owner, {
+      command: 'insert',
+      path,
+      insert_line: 1,
+      new_str: 'new',
+    })
+    expect(insert.isError).toBe(true)
+    expect(text(insert)).toContain('backend write failed')
+  })
+
+  it('rejects invalid plugin config', () => {
+    expect(() => {
+      ToolStrReplaceEditor.apply(new Context(), { maxOutputChars: 0 })
+    }).toThrow('maxOutputChars must be a positive safe integer')
+    expect(() => {
+      ToolStrReplaceEditor.apply(new Context(), { description: ' ' })
+    }).toThrow('description must be non-empty')
+  })
+})

packages/fs/tool-str-replace-editor/tsconfig.json

@@ -0,0 +1,16 @@
+{
+  "extends": "../../../tsconfig.base.json",
+  "compilerOptions": {
+    "rootDir": "src",
+    "outDir": "lib/types"
+  },
+  "include": ["src"],
+  "references": [
+    { "path": "../../../vendor/cordis" },
+    { "path": "../../core/tools" },
+    { "path": "../fs" },
+    { "path": "../../sandbox/sandbox" },
+    { "path": "../../sandbox/sandbox-policy" },
+    { "path": "../../support/invariants" }
+  ]
+}

packages/host/apiproxy/README.i18n.yaml

@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write packages/host/apiproxy/README.md
-README.md: 7129842a0cc89f5fa10c0bceec7cf0997ac71a99
-README.zh.md: 8765627236ea7af9e5cd3b7029133181ef499905
+README.md: bf5d0d762365deae83d004e00b94a0ba805d6a6f
+README.zh.md: 06c2e37d2590c3c75d0a782bcdf4d98e7b398928

packages/host/apiproxy/README.md

@@ -44,3 +44,4 @@ None; this package neither assembles nor sends a provider request.
 - **Reserved seams stay out of `RpcMethodMap`** — `session.fork`, `prompt.mode: 'inject'`, `task.list`, `host.listModels`, and a describe `hostInstanceId` are documented reservations; an unknown method fails loud at envelope parse rather than getting a not-implemented code.
 - **No protocol version field** — client and host ship together; `host.describe` gains a version negotiation field only when an independently released client exists.
 - **Linux native picker requires desktop tooling** — under the `native` capability, `host.pickDirectory` reports an actionable error when neither Zenity nor KDialog is installed; the browse backend is the composition-level fallback (see the [native backend README](../directory-picker-native/README.md)).
+- **A cold session's `updatedAt` counts a mere pickup as a write (per-file backends only)** — the attached projection excludes the `session/end-seed` boundary, because picking a session up is not activity, but a cold session's `updatedAt` is its log file's mtime and every durable write refreshes that, the boundary included. `agentFor()` resumes a cold session on first touch, so merely opening one in a client writes it. This applies only where `locate()` resolves a per-session artifact, i.e. JSONL; SQLite returns `undefined`, so its cold sessions fall back to `createdAt` and are skewed the other way — too old rather than too new — independently of this boundary. A session touched without being worked in therefore sorts newer than its last real activity until it attaches. Separating the two needs a log read, which is exactly what the mtime path exists to avoid; a stored last-activity field in the index would fix it at the source, scoped in the [last-activity-index Agent Note](../../../.agents/notes/proposed/architecture/2026-07-29-durable-last-activity-index.md).

packages/host/apiproxy/README.zh.md

@@ -44,3 +44,4 @@ Workspace 列表与 Session 列表是相互独立的重连基线。`workspace.cr
 - **预留 seam 不进入 `RpcMethodMap`**：`session.fork`、`prompt.mode: 'inject'`、`task.list`、`host.listModels` 和描述字段 `hostInstanceId` 都是已记录的预留项；未知方法会在信封解析时直接失败，而不会返回「尚未实现」错误码。
 - **没有协议版本字段**：客户端与宿主一同发布；只有出现独立发布的客户端后，`host.describe` 才会增加版本协商字段。
 - **Linux 原生选择器依赖桌面工具**：在 `native` 能力下，Zenity 和 KDialog 均未安装时，`host.pickDirectory` 会给出包含解决建议的错误提示；组合层面的回退是 browse 后端（见 [native 后端 README](../directory-picker-native/README.md)）。
+- **冷会话的 `updatedAt` 会把一次单纯的拾起算作写入（仅逐文件后端）**：已附加投影排除了 `session/end-seed` 边界，因为接手一个会话不算活动；但冷会话的 `updatedAt` 取自其日志文件的 mtime，而每一次持久写入都会刷新它，包括这条边界。`agentFor()` 会在首次触碰时恢复一个冷会话，因此在客户端里仅仅打开一个会话就会写入它。这只适用于 `locate()` 能解析出逐会话产物的场景，即 JSONL；SQLite 返回 `undefined`，因此它的冷会话回退到 `createdAt`，偏差方向相反——偏旧而不是偏新——且与这条边界无关。于是一个被触碰过却没有在里面工作过的会话，在重新附加之前会排在它最后一次真实活动之后。要把两者区分开需要读取日志，而这恰恰是 mtime 路径存在的目的；在索引中存储一个最后活动字段可以从源头修好它，范围见[最后活动索引 Agent Note](../../../.agents/notes/proposed/architecture/2026-07-29-durable-last-activity-index.md)。

packages/host/apiproxy/src/api-proxy.ts

@@ -14,6 +14,7 @@ import type {
 import { createUserMessage, ReasoningEffortId } from '@deepseek-ai/dsh-llm'
 import { errorChain } from '@deepseek-ai/dsh-llm'
 import type { MessageSource } from '@deepseek-ai/dsh-llm'
+import { lastActivityTime } from '@deepseek-ai/dsh-session'
 import type { Session, SessionEvent, SessionHeader, SessionId, UserMessage } from '@deepseek-ai/dsh-session'
 import type { SessionPersistence } from '@deepseek-ai/dsh-session-persistence'
 import type { Workspace, WorkspaceRecord } from '@deepseek-ai/dsh-workspace'
@@ -164,7 +165,9 @@ function sessionBlank(session: Session): boolean {
 function summarize(session: Session, running: boolean): SessionSummary {
   return {
     sessionId: session.id,
-    updatedAt: session.events.at(-1)?.time ?? session.header.createdAt,
+    // Excludes end-seed: a resumed-but-untouched session
+    // must not sort as freshly worked in.
+    updatedAt: lastActivityTime(session.events) ?? session.header.createdAt,
     running,
     blank: sessionBlank(session),
     ...session.header.parentSession === undefined ? {} : { parentSessionId: session.header.parentSession },

packages/host/apiproxy/src/api/sessions.ts

@@ -133,7 +133,11 @@ export type QueueAction =
 /** Session list entry (v1 builds no index: list does readdir+stat). */
 export interface SessionSummary {
   sessionId: SessionId
-  /** Persisted file mtime. */
+  /**
+   * Last activity. Attached: the last non-`session/end-seed` event, since a
+   * pickup is not activity. Cold: the log's mtime, or `createdAt` for a backend
+   * with no per-session file (README Known Limitations covers the skew).
+   */
   updatedAt: number
   /** Status of the attached agent; always false for cold (unattached) sessions. */
   running: boolean

packages/host/apiproxy/tests/api-proxy-cold.spec.ts

@@ -78,6 +78,42 @@ describe('sessions.list cold merge', () => {
   })
 })
 
+describe('attached updatedAt excludes end-seed', () => {
+  it('reports the last real work, not the pickup, so a resumed-untouched session does not float', async () => {
+    const ctx = new Context()
+    await ctx.plugin(SessionStore)
+    await ctx.plugin(UserInteractionService)
+    await ctx.plugin(AgentRegistry)
+    const api = createApiProxy(ctx, { provider: 'p', model: 'm', cwd: '/tmp', workspaceRoot: '/tmp' })
+
+    // Old work, resumed just now: the log tail would report the pickup.
+    const worked = 1_000_000
+    const resumed = ctx.sessions.create(sid('resumed-untouched'), {
+      seed: [
+        { type: 'turn/start', seq: 0, time: worked, data: { turn: 1, trigger: { kind: 'message', source: { kind: 'user' } } } },
+        { type: 'turn/end', seq: 1, time: worked, data: { turn: 1, reason: { kind: 'completed' } } },
+      ],
+      meta: { cwd: '/proj', createdAt: 500 },
+    })
+    ctx.agents.register({ id: resumed.id, session: resumed, status: 'idle', ctx } as Agent)
+    const boundary = resumed.events.at(-1)
+    expect(boundary?.type).toBe('session/end-seed')
+    expect(boundary?.time).toBeGreaterThan(worked)
+
+    const listed = await api.sessions.list(request({}))
+    if (!listed.result.ok) throw new Error('list failed')
+    const summary = listed.result.value.items.find(item => item.sessionId === 'resumed-untouched')
+    expect(summary?.updatedAt).toBe(worked)
+
+    // Real work appended after end-seed does move it.
+    resumed.append('turn/start', { turn: 2, trigger: { kind: 'message', source: { kind: 'user' } } })
+    const after = await api.sessions.list(request({}))
+    if (!after.result.ok) throw new Error('list failed')
+    const moved = after.result.value.items.find(item => item.sessionId === 'resumed-untouched')
+    expect(moved?.updatedAt).toBeGreaterThan(worked)
+  })
+})
+
 describe('degenerate composition (no persistence, no factory)', () => {
   it('list skips the cold merge and resume maps a non-not-found failure to internal', async () => {
     const ctx = new Context()

packages/llm/token-meter/tests/token-meter.spec.ts

@@ -417,7 +417,8 @@ describe('replay anchors and surface folds', () => {
     expect(after.surfaceDeltaTokens).toBeLessThan(0)
     expectSurfaceTotal(after)
     expect(before.nodes).toHaveLength(2)
-    expect(before.logRevision).toBe(original.events.length)
+    // The earlier snapshot still reports the log it measured: seed + boundary.
+    expect(before.logRevision).toBe(original.events.length + 1)
     expect(before.surfaceDeltaTokens).toBeGreaterThan(0)
   })
 
@@ -677,13 +678,15 @@ describe('malformed replay and listener lifecycle', () => {
       content: [{ type: 'text', text: 'one' }],
       source: { kind: 'user' },
     }), { surfaceOp: 'append' })
-    expect(revisions).toEqual([2])
-    expect(activeMeter.measure(session).logRevision).toBe(2)
+    // Seed, end-seed, then one live append. Only the last event published:
+    // end-seed predates store attachment, like the seed.
+    expect(revisions).toEqual([3])
+    expect(activeMeter.measure(session).logRevision).toBe(3)
 
     await firstFiber.dispose()
     const secondFiber = await ctx.plugin(TokenMeterService)
     activeMeter = ctx.tokenMeter
-    expect(activeMeter.measure(session).logRevision).toBe(2)
+    expect(activeMeter.measure(session).logRevision).toBe(3)
     await secondFiber.dispose()
   })
 })

packages/pty/README.i18n.yaml

@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write packages/pty/README.md
-README.md: a9121455519a5f83a63a005cb857fec0f0e06b92
-README.zh.md: 4e36ef934d31861d72748b9b9585695f86749171
+README.md: e54dcf64db083665f37b7dc19a7a92e21494442b
+README.zh.md: 0bb7e565a5799002ffb8b74dce12e129a7b2665e

packages/pty/README.md

@@ -9,5 +9,6 @@ English | [中文](README.zh.md)
 | [`pty`](pty/README.md) (`@deepseek-ai/dsh-pty`) | Backend registry, branded ids, exact-Agent ownership, session operations, and awaited cleanup | `ctx.pty` |
 | `pty-local` (`@deepseek-ai/dsh-pty-local`) | Local `node-pty` backend, readiness detection, bounded terminal state, sandboxing, and process-session supervision | registers on `ctx.pty` |
 | `tool-pty` (`@deepseek-ai/dsh-tool-pty`) | Six model-facing tools and generic task integration for background sends | registers on `ctx.tools` |
+| `tool-bash-persistent` (`@deepseek-ai/dsh-tool-bash-persistent`) | One model-facing `bash` backed by an owner-scoped reusable PTY shell | consumes `ctx.pty`, registers on `ctx.tools` |
 
 The design and deferred boundaries live in the [persistent PTY Agent Note](../../.agents/notes/implemented/feature/2026-07-16-persistent-pty-sessions.md).

packages/pty/README.zh.md

@@ -9,5 +9,6 @@
 | [`pty`](pty/README.md)（`@deepseek-ai/dsh-pty`） | 后端注册表、品牌化 id、精确到 agent（智能体）的所有权、会话操作与等待清理完成的机制 | `ctx.pty` |
 | `pty-local`（`@deepseek-ai/dsh-pty-local`） | 本地 `node-pty` 后端、就绪检测、有界终端状态、沙箱与进程会话监管 | 注册到 `ctx.pty` |
 | `tool-pty`（`@deepseek-ai/dsh-tool-pty`） | 6 个面向模型的工具，以及用于后台发送的通用任务集成 | 注册到 `ctx.tools` |
+| `tool-bash-persistent`（`@deepseek-ai/dsh-tool-bash-persistent`） | 一个由所有者隔离可复用 PTY shell 支撑的模型可见 `bash` | 消费 `ctx.pty`，注册到 `ctx.tools` |
 
 设计与暂缓边界记录在[持久 PTY Agent Note（agent 决策记录）](../../.agents/notes/implemented/feature/2026-07-16-persistent-pty-sessions.md) 中。

packages/pty/tool-bash-persistent/README.i18n.yaml

@@ -0,0 +1,6 @@
+# Bilingual-pair consistency record (docs/i18n/README.md): the git blob hash of each
+# side as of the last confirmed-consistent state. Both languages carry equal authority;
+# after editing either side, bring the other along and re-record with:
+#   pnpm run verify-translation-pairing --write packages/pty/tool-bash-persistent/README.md
+README.md: cfb3acf41803f5b06ecb3f56ee8ffc29ce9147b1
+README.zh.md: a525485933344a8f9bc218456c099efdef572902

packages/pty/tool-bash-persistent/README.md

@@ -0,0 +1,50 @@
+# @deepseek-ai/dsh-tool-bash-persistent
+
+English | [中文](README.zh.md)
+
+Model-facing `bash(command)` backed by one owner-scoped `ctx.pty` shell. The package owns the tool contract and shell reuse; deployments select the PTY backend and sandbox policy.
+
+## Config
+
+| Key | Default | Meaning |
+|---|---:|---|
+| `backendType` | `shell` | Registered PTY backend used for each Agent shell. |
+| `timeoutMs` | `300000` | Wall-clock limit for one command; timeout closes the shell. |
+| `maxOutputChars` | `16000` | Maximum retained command-output characters; fixed diagnostics are added afterward. |
+| `description` | Persistent-shell description | Model-facing environment contract. |
+
+## Model Experience
+
+### Tool schema
+
+#### What the model sees
+
+The generated [`bash` schema](../../../docs/tool-catalog.md#deepseek-aidsh-tool-bash-persistent), including the configured `description`. The plugin contributes no standalone system-prompt section; the deployment owns persona and environment guidance.
+
+#### Token effect
+
+Fixed schema cost while `bash` is visible.
+
+#### KV Cache effect
+
+Prefix-stable while the configured description and schema remain unchanged.
+
+### Tool results
+
+#### What the model sees
+
+Commands share one shell per Agent, so cwd, exported variables, activated environments, functions, and background jobs persist across calls. Results exclude private completion markers and the shell prompt. A nonzero wrapped command appends `[exit code: N]`; a shell that exits before reporting that status instead appends `[shell exited: code N]`, `[shell killed by signal: SIG]`, or `[shell exited]` when the backend supplies neither, then resets and tells the model that the next call starts fresh. Long output keeps the earliest retained prefix plus a clipping notice. If the PTY has already dropped that prefix, the result says so explicitly instead of presenting a tail as complete output. Timeout returns bounded partial output, closes the uncertain shell, and reports the reset.
+
+#### Token effect
+
+Data-dependent. `maxOutputChars` bounds retained command output; fixed clipping, lost-prefix, status, timeout, and reset diagnostics can extend the result.
+
+#### KV Cache effect
+
+Append-only tool results follow the reusable request prefix.
+
+## Known Limitations and Deferred Work
+
+- The tool requires an owning Agent and a real PTY backend.
+- Explicit `exit` and timeout discard shell state. Cancellation also resets and discards the result, even when a complete status marker is already observable; the next call starts a fresh shell.
+- Environment facts such as network access and package mirrors belong in the configured `description`, not this package's default.

packages/pty/tool-bash-persistent/README.zh.md

@@ -0,0 +1,50 @@
+# @deepseek-ai/dsh-tool-bash-persistent
+
+[English](README.md) | 中文
+
+模型可见的 `bash(command)`，底层复用一个按所有者隔离的 `ctx.pty` shell。该包拥有工具契约和 shell 复用；PTY 后端与沙箱策略由部署选择。
+
+## 配置
+
+| 键 | 默认值 | 含义 |
+|---|---:|---|
+| `backendType` | `shell` | 每个 Agent shell 使用的已注册 PTY 后端。 |
+| `timeoutMs` | `300000` | 单条命令的墙钟时间上限；超时会关闭 shell。 |
+| `maxOutputChars` | `16000` | 命令输出最多保留的字符数；固定诊断会在此后追加。 |
+| `description` | 持久 shell 描述 | 面向模型的环境契约。 |
+
+## 模型体验
+
+### 工具 schema
+
+#### 模型所见
+
+生成的 [`bash` schema](../../../docs/tool-catalog.md#deepseek-aidsh-tool-bash-persistent)，其中包含配置的 `description`。本插件不贡献独立系统提示词段；persona 与环境指导由部署负责。
+
+#### Token 影响
+
+`bash` 可见时产生固定的 schema 成本。
+
+#### KV Cache 影响
+
+配置的描述与 schema 不变时前缀稳定。
+
+### 工具结果
+
+#### 模型所见
+
+每个 Agent 的命令共享一个 shell，因此 cwd、导出的环境变量、已激活环境、函数和后台任务会跨调用保留。结果不包含私有完成标记和 shell 提示符。经封装的命令以非零状态结束时，结果会追加 `[exit code: N]`；若 shell 在报告该状态前退出，则改为追加 `[shell exited: code N]`、`[shell killed by signal: SIG]`，或在后端既未提供退出码也未提供信号时追加 `[shell exited]`；随后重置 shell，并告知模型下次调用从新 shell 开始。长输出保留仍可读取的最早前缀并追加截断提示；若 PTY 已丢弃真正的开头，结果会明确说明，而不是把尾部伪装成完整输出。超时返回有界的部分输出、关闭状态不确定的 shell，并报告该重置。
+
+#### Token 影响
+
+随数据变化。`maxOutputChars` 限制保留的命令输出；固定的截断、前缀丢失、状态、超时与重置诊断可能使结果更长。
+
+#### KV Cache 影响
+
+工具结果以追加方式位于可复用请求前缀之后。
+
+## 已知限制与延后工作
+
+- 工具需要拥有它的 Agent 和真实 PTY 后端。
+- 显式 `exit` 与超时会丢弃 shell 状态。取消同样会重置 shell 并丢弃结果，即使已经能观察到完整状态标记也是如此；下次调用创建新 shell。
+- 网络访问、软件包镜像等环境事实应写入配置的 `description`，而非包默认描述。

packages/pty/tool-bash-persistent/package.json

@@ -0,0 +1,55 @@
+{
+  "name": "@deepseek-ai/dsh-tool-bash-persistent",
+  "description": "Model-facing owner-scoped persistent Bash tool backed by the Harness PTY service",
+  "version": "0.0.1",
+  "private": true,
+  "type": "module",
+  "main": "lib/index.js",
+  "types": "lib/types/index.d.ts",
+  "exports": {
+    ".": {
+      "types": "./lib/types/index.d.ts",
+      "default": "./lib/index.js"
+    },
+    "./invariant": {
+      "types": "./lib/types/invariant.d.ts",
+      "default": "./lib/invariant.js"
+    },
+    "./package.json": "./package.json"
+  },
+  "files": [
+    "lib/index.js",
+    "lib/invariant.js",
+    "lib/types/**/*.d.ts",
+    "lib/types/**/*.d.ts.map",
+    "src"
+  ],
+  "license": "BSD-3-Clause",
+  "peerDependencies": {
+    "@deepseek-ai/dsh-agent": "^0.0.1",
+    "@deepseek-ai/dsh-invariants": "^0.0.1",
+    "@deepseek-ai/dsh-pty": "^0.0.1",
+    "@deepseek-ai/dsh-timeout": "^0.0.1",
+    "@deepseek-ai/dsh-tools": "^0.0.1",
+    "cordis": "^4.0.0-rc.7"
+  },
+  "dependencies": {
+    "schemastery": "^3.18.0"
+  },
+  "devDependencies": {
+    "@cordisjs/plugin-include": "workspace:^",
+    "@cordisjs/plugin-loader": "workspace:^",
+    "@deepseek-ai/dsh-agent": "workspace:^",
+    "@deepseek-ai/dsh-invariants": "workspace:^",
+    "@deepseek-ai/dsh-llm": "workspace:^",
+    "@deepseek-ai/dsh-pty": "workspace:^",
+    "@deepseek-ai/dsh-pty-local": "workspace:^",
+    "@deepseek-ai/dsh-sandbox": "workspace:^",
+    "@deepseek-ai/dsh-sandbox-policy": "workspace:^",
+    "@deepseek-ai/dsh-session": "workspace:^",
+    "@deepseek-ai/dsh-system-prompt": "workspace:^",
+    "@deepseek-ai/dsh-timeout": "workspace:^",
+    "@deepseek-ai/dsh-tools": "workspace:^",
+    "cordis": "^4.0.0-rc.7"
+  }
+}

packages/pty/tool-bash-persistent/src/index.ts

@@ -0,0 +1,445 @@
+/**
+ * Model-facing persistent `bash` tool over the owner-scoped PTY seam.
+ * @module @deepseek-ai/dsh-tool-bash-persistent
+ */
+
+import { randomUUID } from 'node:crypto'
+import type { Context } from 'cordis'
+import z from 'schemastery'
+import type { Agent } from '@deepseek-ai/dsh-agent'
+import type { PtyReadResult, PtySendResult, PtySessionId } from '@deepseek-ai/dsh-pty'
+import { deadline, timeoutOf } from '@deepseek-ai/dsh-timeout'
+import { defineTool } from '@deepseek-ai/dsh-tools'
+
+// TODO: Replace the file-search advice; arbitrary command output need not come from a searchable file.
+const TRUNCATED_MESSAGE = '<response clipped><NOTE>To save on context only part of this file has been shown to you. You should retry this tool after you have searched inside the file with `grep -n` in order to find the line numbers of what you are looking for.</NOTE>'
+const LOST_PREFIX_MESSAGE = '<response clipped><NOTE>The beginning of this command output was dropped by the terminal scrollback limit. The following text is the earliest retained output.</NOTE>\n'
+const SHELL_RESET_MESSAGE = 'The persistent bash shell was reset; the next bash call starts from the workspace with a fresh current directory and environment.'
+const SHELL_PROMPT = '__DSH_PERSISTENT_BASH_PROMPT__ '
+const TIMEOUT_CODE = 'PERSISTENT_BASH_TIMEOUT'
+// One page is enough to find a just-emitted completion marker; the full
+// scrollback is assembled only when a command settles or needs partial output.
+const SCROLLBACK_PAGE_LINES = 1_000
+const POLL_INTERVAL_MS = 25
+
+const DEFAULT_DESCRIPTION = 'Run commands in a persistent bash shell. State, including the current directory and exported environment variables, persists across calls for this agent.'
+
+interface ResolvedConfig {
+  backendType: string
+  timeoutMs: number
+  maxOutputChars: number
+  description: string
+}
+
+interface CommandMarkers {
+  start: string
+  end: string
+}
+
+interface RetainedOutput {
+  text: string
+  truncated: boolean
+}
+
+interface CapturedOutput {
+  text: string
+  incomplete: boolean
+  exitCode?: number
+}
+
+interface PersistentShells {
+  get(owner: Agent, signal: AbortSignal): Promise<PtySessionId>
+  reset(owner: Agent, reason: string): Promise<void>
+}
+
+function maybeTruncate(content: string, maxOutputChars: number, incomplete = false): string {
+  if (content.length <= maxOutputChars && !incomplete) return content
+  return content.length <= maxOutputChars
+    ? content + TRUNCATED_MESSAGE
+    : content.slice(0, maxOutputChars) + TRUNCATED_MESSAGE
+}
+
+function markers(): CommandMarkers {
+  const nonce = randomUUID()
+  return {
+    start: `__DSH_PERSISTENT_BASH_START_${nonce}__`,
+    end: `__DSH_PERSISTENT_BASH_END_${nonce}:`,
+  }
+}
+
+function quoteForBash(value: string): string {
+  return `$'${value
+    .replaceAll('\\', '\\\\')
+    .replaceAll("'", "\\'")
+    .replaceAll('\r', '\\r')
+    .replaceAll('\n', '\\n')}'`
+}
+
+function wrapCommand(command: string, marker: CommandMarkers): string {
+  // Keep the wrapper on one physical line. An interactive bash prints PS2 for
+  // embedded newlines before executing the buffer, which would leak terminal
+  // prompts and marker source text into the model-facing result.
+  return `printf '%s\\n' ${quoteForBash(marker.start)}; eval -- ${quoteForBash(command)}; __dsh_persistent_bash_status=$?; printf '%s%s\\n' ${quoteForBash(marker.end)} "$__dsh_persistent_bash_status"`
+}
+
+function stripPrompt(text: string): string {
+  let result = text.replace(/\r?\n$/, '')
+  while (result.endsWith(SHELL_PROMPT)) {
+    result = result.slice(0, -SHELL_PROMPT.length)
+  }
+  return result.endsWith('\n') ? result.slice(0, -1) : result
+}
+
+function commandOutput(
+  snapshot: RetainedOutput,
+  marker: CommandMarkers,
+): CapturedOutput | undefined {
+  const text = snapshot.text
+  const end = text.lastIndexOf(marker.end)
+  const status = /^(\d+)\r?\n/.exec(text.slice(end + marker.end.length))?.[1]
+  if (status === undefined) return undefined
+  const startMarker = text.lastIndexOf(marker.start, end)
+  const start = startMarker < 0 ? 0 : startMarker + marker.start.length
+  return {
+    text: stripPrompt(text.slice(start, end).replace(/^\r?\n/, '')),
+    incomplete: startMarker < 0,
+    exitCode: Number(status),
+  }
+}
+
+function promptCompleted(result: PtySendResult): boolean {
+  return result.viewport.endsWith(SHELL_PROMPT)
+    || result.viewport.endsWith(`${SHELL_PROMPT}\r\n`)
+    || result.viewport.endsWith(`${SHELL_PROMPT}\n`)
+}
+
+function partialOutput(
+  snapshot: RetainedOutput,
+  marker: CommandMarkers,
+  fallback: string,
+  fallbackTruncated = false,
+): CapturedOutput {
+  const startMarker = snapshot.text.lastIndexOf(marker.start)
+  if (startMarker >= 0) {
+    return {
+      text: stripPrompt(snapshot.text.slice(startMarker + marker.start.length).replace(/^\r?\n/, '')),
+      incomplete: false,
+    }
+  }
+  const fallbackStart = fallback.lastIndexOf(marker.start)
+  const afterStart = fallbackStart < 0
+    ? fallback
+    : fallback.slice(fallbackStart + marker.start.length).replace(/^\r?\n/, '')
+  const fallbackEnd = afterStart.lastIndexOf(marker.end)
+  const beforeEnd = fallbackEnd < 0 ? afterStart : afterStart.slice(0, fallbackEnd)
+  return {
+    text: stripPrompt(beforeEnd.replaceAll(SHELL_PROMPT, '')),
+    incomplete: fallbackTruncated || fallbackStart < 0,
+  }
+}
+
+async function pause(): Promise<void> {
+  await new Promise(resolve => setTimeout(resolve, POLL_INTERVAL_MS))
+}
+
+function nextScrollbackOffset(page: PtyReadResult, offset: number): number | undefined {
+  if (page.text.length === 0 || page.lineEnd <= offset) return undefined
+  return page.lineEnd
+}
+
+function retainedScrollback(
+  ctx: Context,
+  owner: Agent,
+  id: PtySessionId,
+  latest = ctx.pty.read(owner, id, { offset: 0, count: SCROLLBACK_PAGE_LINES }),
+): RetainedOutput {
+  const pages: string[] = latest.text.length === 0 ? [] : [latest.text]
+  let offset = latest.lineEnd
+  let truncated = latest.truncated
+  while (true) {
+    if (offset >= latest.totalLines) break
+    const page = ctx.pty.read(owner, id, { offset, count: SCROLLBACK_PAGE_LINES })
+    truncated ||= page.truncated
+    if (page.text.length > 0) pages.unshift(page.text)
+    const next = nextScrollbackOffset(page, offset)
+    if (next === undefined || next >= page.totalLines) break
+    offset = next
+  }
+  return { text: pages.join('\n'), truncated }
+}
+
+function renderCaptured(output: CapturedOutput, maxOutputChars: number): string {
+  const rendered = maybeTruncate(output.text, maxOutputChars, output.incomplete)
+  const withPrefix = output.incomplete && output.text.length > 0
+    ? LOST_PREFIX_MESSAGE + rendered
+    : rendered
+  const marker = output.exitCode !== undefined && output.exitCode !== 0
+    ? `[exit code: ${output.exitCode}]`
+    : undefined
+  return appendStatusMarker(withPrefix, marker)
+}
+
+function appendStatusMarker(content: string, marker: string | undefined): string {
+  if (marker === undefined) return content
+  return content.length === 0 ? marker : `${content}\n${marker}`
+}
+
+function renderShellExitStatus(
+  content: string,
+  exitCode: number | null,
+  signal: NodeJS.Signals | null,
+): string {
+  const marker = signal !== null
+    ? `[shell killed by signal: ${signal}]`
+    : exitCode !== null
+      ? `[shell exited: code ${exitCode}]`
+      : '[shell exited]'
+  return appendStatusMarker(content, marker)
+}
+
+function persistentShells(ctx: Context, config: ResolvedConfig): PersistentShells {
+  const pending = new WeakMap<Agent, Promise<PtySessionId>>()
+  const live = new Map<Agent, PtySessionId>()
+  const creating = new Set<Promise<PtySessionId>>()
+  const ownerCleanupInstalled = new WeakSet<Agent>()
+  const lifecycle = new AbortController()
+
+  const close = async (owner: Agent, id: PtySessionId, reason: string): Promise<void> => {
+    if (!ctx.pty.list(owner).some(snapshot => snapshot.sessionId === id)) return
+    await ctx.pty.kill(owner, id, reason)
+  }
+
+  ctx.effect(() => async () => {
+    lifecycle.abort(new Error('tool-bash-persistent disposed during shell creation'))
+    await Promise.allSettled([...creating])
+    const closing = [...live].map(async ([owner, id]) => { await close(owner, id, 'tool-bash-persistent disposed') })
+    await Promise.all(closing)
+    live.clear()
+  }, 'tool-bash-persistent shell cleanup')
+
+  const reset = async (owner: Agent, reason: string): Promise<void> => {
+    pending.delete(owner)
+    const id = live.get(owner)
+    live.delete(owner)
+    if (id !== undefined) await close(owner, id, reason)
+  }
+
+  const get = (owner: Agent, signal: AbortSignal): Promise<PtySessionId> => {
+    const existing = pending.get(owner)
+    if (existing !== undefined) return existing
+    const combinedSignal = AbortSignal.any([signal, lifecycle.signal])
+    const creation = (async () => {
+      try {
+        const cwd = owner.session.header.cwd
+        const spawned = await ctx.pty.spawn(owner, {
+          type: config.backendType,
+          ...cwd === undefined ? {} : { cwd },
+        }, combinedSignal)
+        live.set(owner, spawned.sessionId)
+        if (!ownerCleanupInstalled.has(owner)) {
+          ownerCleanupInstalled.add(owner)
+          owner.ctx.effect(() => () => {
+            pending.delete(owner)
+            live.delete(owner)
+          }, 'tool-bash-persistent owner cache cleanup')
+        }
+        const setup = ctx.pty.startSend(owner, spawned.sessionId, {
+          text: `stty -echo; PS1=${quoteForBash(SHELL_PROMPT)}`,
+          submit: true,
+          signal: combinedSignal,
+        })
+        const result = await setup.done
+        if (result.sessionStatus.kind === 'exited' || result.waitReason === 'timeout') {
+          throw new Error('persistent bash shell did not accept initialization')
+        }
+        return spawned.sessionId
+      } catch (error: unknown) {
+        await reset(owner, 'persistent bash initialization failed')
+        throw error
+      }
+    })()
+    const tracked = creation.finally(() => {
+      creating.delete(tracked)
+    })
+    creating.add(tracked)
+    pending.set(owner, tracked)
+    return tracked
+  }
+
+  return { get, reset }
+}
+
+async function executeCommand(
+  ctx: Context,
+  shells: PersistentShells,
+  owner: Agent,
+  command: string,
+  config: ResolvedConfig,
+  upstream: AbortSignal,
+): Promise<string> {
+  using commandDeadline = deadline(upstream, config.timeoutMs, TIMEOUT_CODE)
+  const id = await shells.get(owner, commandDeadline.signal)
+  const marker = markers()
+  const wrapped = wrapCommand(command, marker)
+  let first = true
+  let fallback = ''
+  let fallbackTruncated = false
+
+  while (true) {
+    let operation
+    let result
+    try {
+      operation = ctx.pty.startSend(owner, id, {
+        text: first ? wrapped : '',
+        submit: first,
+        signal: commandDeadline.signal,
+      })
+      first = false
+      result = await operation.done
+    } catch (error: unknown) {
+      await shells.reset(owner, 'persistent bash send failed')
+      throw error
+    }
+    const incremental = operation.readOutput()
+    fallback = incremental.delta.length > 0 ? fallback + incremental.delta : result.viewport
+    fallbackTruncated ||= incremental.truncated || result.truncated
+    const latest = ctx.pty.read(owner, id, { offset: 0, count: SCROLLBACK_PAGE_LINES })
+    const timedOut = timeoutOf(commandDeadline.signal, TIMEOUT_CODE)
+    if (timedOut !== undefined) {
+      const snapshot = retainedScrollback(ctx, owner, id, latest)
+      const partial = renderCaptured(
+        partialOutput(snapshot, marker, fallback, fallbackTruncated),
+        config.maxOutputChars,
+      )
+      await shells.reset(owner, 'persistent bash command timed out')
+      return [
+        // TODO: Report a timeout only; this signal does not establish an OOM.
+        `Your command timed out after ${Math.round(timedOut.timeoutMs / 1000)} seconds or experienced an OOM error. Below is partial output:`,
+        partial,
+        SHELL_RESET_MESSAGE,
+      ].join('\n')
+    }
+    if (commandDeadline.signal.aborted) {
+      await shells.reset(owner, 'persistent bash command aborted')
+      commandDeadline.signal.throwIfAborted()
+    }
+    if (latest.text.includes(marker.end)) {
+      const complete = commandOutput(retainedScrollback(ctx, owner, id, latest), marker)
+      if (complete !== undefined) return renderCaptured(complete, config.maxOutputChars)
+    }
+    if (result.sessionStatus.kind === 'exited') {
+      const snapshot = retainedScrollback(ctx, owner, id, latest)
+      await shells.reset(owner, 'persistent bash shell exited')
+      return [
+        renderShellExitStatus(
+          renderCaptured(partialOutput(snapshot, marker, fallback, fallbackTruncated), config.maxOutputChars),
+          result.sessionStatus.exitCode,
+          result.sessionStatus.signal,
+        ),
+        SHELL_RESET_MESSAGE,
+      ].filter(part => part.length > 0).join('\n')
+    }
+    if (promptCompleted(result)) {
+      const snapshot = retainedScrollback(ctx, owner, id, latest)
+      return renderCaptured(
+        partialOutput(snapshot, marker, fallback, fallbackTruncated),
+        config.maxOutputChars,
+      )
+    }
+    await pause()
+  }
+}
+
+/**
+ * Register the model-facing persistent `bash` tool.
+ * @param ctx - plugin context carrying tools and the owner-scoped PTY service.
+ * @param config - selected PTY backend and command deadline.
+ */
+function registerPersistentBash(ctx: Context, config: ResolvedConfig): void {
+  const shells = persistentShells(ctx, config)
+  const queues = new WeakMap<Agent, Promise<void>>()
+
+  const serialized = async <T>(owner: Agent, operation: () => Promise<T>): Promise<T> => {
+    const prior = queues.get(owner) ?? Promise.resolve()
+    const run = prior.then(operation, operation)
+    const tail = run.then(() => undefined, () => undefined)
+    queues.set(owner, tail)
+    try {
+      return await run
+    } finally {
+      if (queues.get(owner) === tail) queues.delete(owner)
+    }
+  }
+
+  ctx.tools.register(defineTool({
+    name: 'bash',
+    description: config.description,
+    parameters: {
+      command: {
+        type: 'string',
+        required: true,
+        description: 'The bash command to run. Relative path is preferred in the command.',
+      },
+    },
+    output: {
+      schema: { type: 'string' },
+      render: (_args, value) => [{ type: 'text', text: value }],
+    },
+    async execute(args, exec) {
+      if (args.command.trim().length === 0) throw new Error('command must be a non-empty string')
+      const owner = exec.agent
+      if (owner === undefined) throw new Error('bash requires an owning agent session')
+      return serialized(owner, async () => {
+        exec.signal.throwIfAborted()
+        return executeCommand(ctx, shells, owner, args.command, config, exec.signal)
+      })
+    },
+    presentCall: args => ({ card: 'terminal', title: args.command }),
+  }))
+}
+
+export const name = 'tool-bash-persistent'
+export const inject = ['tools', 'pty']
+
+/** Configuration for the persistent Bash tool. */
+export interface Config {
+  /** PTY backend used for each owner-isolated persistent shell (default `shell`). */
+  backendType?: string
+  /** Wall-clock limit for one command (default 300000). */
+  timeoutMs?: number
+  /** Maximum returned command-output characters before clipping (default 16000). */
+  maxOutputChars?: number
+  /** Model-facing tool description; deployments may describe their environment. */
+  description?: string
+}
+
+/** Runtime configuration schema for the persistent Bash tool. */
+export const Config: z<Config> = z.object({
+  backendType: z.string().default('shell'),
+  timeoutMs: z.number().default(300_000),
+  maxOutputChars: z.number().default(16_000),
+  description: z.string().default(DEFAULT_DESCRIPTION),
+})
+
+/** Register one owner-scoped persistent `bash` tool. */
+export function apply(ctx: Context, config: Config): void {
+  const resolved: ResolvedConfig = {
+    backendType: config.backendType ?? 'shell',
+    timeoutMs: config.timeoutMs ?? 300_000,
+    maxOutputChars: config.maxOutputChars ?? 16_000,
+    description: config.description ?? DEFAULT_DESCRIPTION,
+  }
+  if (resolved.backendType.trim().length === 0) {
+    throw new Error('tool-bash-persistent: backendType must be non-empty')
+  }
+  if (!Number.isSafeInteger(resolved.timeoutMs) || resolved.timeoutMs <= 0) {
+    throw new Error('tool-bash-persistent: timeoutMs must be a positive safe integer')
+  }
+  if (!Number.isSafeInteger(resolved.maxOutputChars) || resolved.maxOutputChars <= 0) {
+    throw new Error('tool-bash-persistent: maxOutputChars must be a positive safe integer')
+  }
+  if (resolved.description.trim().length === 0) {
+    throw new Error('tool-bash-persistent: description must be non-empty')
+  }
+  registerPersistentBash(ctx, resolved)
+}

packages/pty/tool-bash-persistent/src/invariant.ts

@@ -0,0 +1,31 @@
+/**
+ * Package-owned invariant companion for `@deepseek-ai/dsh-tool-bash-persistent`.
+ * @module @deepseek-ai/dsh-tool-bash-persistent/invariant
+ */
+
+/* jscpd:ignore-start */
+import type { Context } from 'cordis'
+import type { InvariantInstaller } from '@deepseek-ai/dsh-invariants'
+
+const PACKAGE_NAME = '@deepseek-ai/dsh-tool-bash-persistent'
+
+/** Cordis companion plugin name. */
+export const name = 'tool-bash-persistent-invariant'
+/** Service required before the companion can reserve package ownership. */
+export const inject = ['invariants']
+
+/**
+ * No runtime invariant: the adapter's private owner-to-shell cache has no
+ * observable event or data relation. Lifecycle tests prove its cleanup without
+ * adding a public surface solely for an invariant.
+ */
+const install: InvariantInstaller = () => {}
+
+/**
+ * Register this package's invariant companion.
+ * @param ctx - Cordis context carrying the invariant service.
+ * @returns the installed registration's disposer after setup succeeds.
+ */
+export const apply = (ctx: Context): Promise<() => void> =>
+  Promise.resolve(ctx.invariants.register(PACKAGE_NAME, install))
+/* jscpd:ignore-end */

packages/pty/tool-bash-persistent/tests/loader-composition.spec.ts

@@ -0,0 +1,157 @@
+import { mkdtemp, rm, writeFile } from 'node:fs/promises'
+import { tmpdir } from 'node:os'
+import { join } from 'node:path'
+import { pathToFileURL } from 'node:url'
+import { afterEach, describe, expect, it } from 'vitest'
+import { Context } from 'cordis'
+import Loader from '@cordisjs/plugin-loader'
+import Include from '@cordisjs/plugin-include'
+import { CallId } from '@deepseek-ai/dsh-llm'
+import { Session, SessionId } from '@deepseek-ai/dsh-session'
+import AgentRegistry from '@deepseek-ai/dsh-agent'
+import type { Agent } from '@deepseek-ai/dsh-agent'
+import PtyService from '@deepseek-ai/dsh-pty'
+import * as PtyLocal from '@deepseek-ai/dsh-pty-local'
+import SandboxProvider from '@deepseek-ai/dsh-sandbox'
+import type { ConfinedArgv, SandboxPolicy } from '@deepseek-ai/dsh-sandbox'
+import SandboxPolicyService from '@deepseek-ai/dsh-sandbox-policy'
+import SystemPrompt from '@deepseek-ai/dsh-system-prompt'
+import ToolRegistry from '@deepseek-ai/dsh-tools'
+import * as ToolBashPersistent from '@deepseek-ai/dsh-tool-bash-persistent'
+
+let root: string | undefined
+let context: Context | undefined
+
+afterEach(async () => {
+  await context?.fiber.dispose()
+  context = undefined
+  if (root !== undefined) await rm(root, { recursive: true, force: true })
+  root = undefined
+})
+
+class PassthroughSandbox extends SandboxProvider {
+  confine(argv: readonly string[], _policy: SandboxPolicy): ConfinedArgv {
+    return { argv: [...argv], enforcement: 'full', denialSignatures: [], runnerFailureSignatures: [] }
+  }
+}
+
+function agent(ctx: Context, cwd: string): Agent {
+  const id = SessionId('persistent-bash-loader-agent')
+  const scope = ctx.plugin(() => {})
+  const value: Agent = {
+    id,
+    options: {},
+    session: new Session(id, [], { version: 0, id, createdAt: 0, cwd }),
+    status: 'idle',
+    acceptsNextStep: false,
+    ctx: scope.ctx,
+    followup: () => {},
+    steer: () => {},
+    inject: () => {},
+    send: () => {},
+    updateInbox: () => 'not-found',
+    cancel() {},
+    whenIdle: () => Promise.resolve(),
+  }
+  ctx.agents.register(value)
+  return value
+}
+
+function text(result: { content: { type: string; text?: string }[] }): string {
+  return result.content.filter(block => block.type === 'text').map(block => block.text).join('')
+}
+
+const suite = process.platform === 'linux' || process.platform === 'darwin' ? describe : describe.skip
+
+suite('persistent Bash through a real cordis.yml Loader composition', () => {
+  it('preserves cwd and environment across calls', async () => {
+    root = await mkdtemp(join(tmpdir(), 'dsh-persistent-bash-loader-'))
+    const configPath = join(root, 'cordis.yml')
+    await writeFile(configPath, [
+      "- name: '@deepseek-ai/dsh-agent'",
+      "- name: '@deepseek-ai/dsh-system-prompt'",
+      "- name: '@deepseek-ai/dsh-tools'",
+      "- name: '@deepseek-ai/dsh-pty'",
+      "- name: '@deepseek-ai/dsh-test-sandbox'",
+      "- name: '@deepseek-ai/dsh-sandbox-policy'",
+      '  config:',
+      '    mode: danger-full-access',
+      `    workspaceRoot: ${JSON.stringify(root)}`,
+      "- name: '@deepseek-ai/dsh-pty-local'",
+      '  config:',
+      '    pollIntervalMs: 10',
+      '    exactProbeAfterMs: 20',
+      '    idleSilenceMs: 100',
+      '    handoffGraceMs: 100',
+      '    scrollbackLines: 20000',
+      '    timeoutMs: 2000',
+      '    disposeGraceMs: 500',
+      "- name: '@deepseek-ai/dsh-tool-bash-persistent'",
+      '  config:',
+      '    timeoutMs: 5000',
+      '',
+    ].join('\n'))
+
+    context = new Context()
+    context.baseUrl = pathToFileURL(root).href + '/'
+    await context.plugin(Loader)
+    context.loader.builtins.include = Include
+    const modules = new Map<string, unknown>([
+      ['@deepseek-ai/dsh-agent', AgentRegistry],
+      ['@deepseek-ai/dsh-system-prompt', SystemPrompt],
+      ['@deepseek-ai/dsh-tools', ToolRegistry],
+      ['@deepseek-ai/dsh-pty', PtyService],
+      ['@deepseek-ai/dsh-test-sandbox', PassthroughSandbox],
+      ['@deepseek-ai/dsh-sandbox-policy', SandboxPolicyService],
+      ['@deepseek-ai/dsh-pty-local', PtyLocal],
+      ['@deepseek-ai/dsh-tool-bash-persistent', ToolBashPersistent],
+    ])
+    context.loader.internal = {
+      version: 'v2',
+      async import(specifier: string) {
+        if (!modules.has(specifier)) throw new Error(`unexpected Loader import: ${specifier}`)
+        return modules.get(specifier)
+      },
+    } as unknown as NonNullable<typeof context.loader.internal>
+    await context.loader.create({ name: 'cordis:include', config: { path: pathToFileURL(configPath).href } })
+    await context.loader.await()
+
+    const owner = agent(context, root)
+    const signal = new AbortController().signal
+    const execute = (id: string, command: string) => context!.tools.execute({
+      signal,
+      callId: CallId(id),
+      name: 'bash',
+      arguments: { command },
+      agent: owner,
+    })
+
+    expect(context.tools.schemas().map(schema => schema.name)).toEqual(['bash'])
+    await execute('state', 'export KEEP=loader; mkdir -p nested; cd nested')
+    const observed = text(await execute('observe', 'printf "cwd=%s keep=%s\\n" "$PWD" "$KEEP"'))
+    expect(observed).toContain(`cwd=${join(root, 'nested')} keep=loader`)
+    expect(observed).not.toContain('DSH_PERSISTENT_BASH')
+
+    const multiline = text(await execute(
+      'multiline',
+      'value="line one"\nprintf "%s:%s\\n" "$value" "it\'s fine"',
+    ))
+    expect(multiline).toBe("line one:it's fine")
+    expect(multiline).not.toContain('DSH_PERSISTENT_BASH')
+
+    const heredoc = text(await execute(
+      'heredoc',
+      "cat <<'EOF'\nalpha\nbeta\nEOF",
+    ))
+    expect(heredoc).toBe('alpha\nbeta')
+
+    const large = text(await execute('large-output', 'seq 1 12050'))
+    expect(large.startsWith('1\n2\n3\n')).toBe(true)
+    expect(large).toContain('<response clipped>')
+    expect(large).not.toContain('beginning of this command output was dropped')
+
+    const exited = text(await execute('exit', 'exit'))
+    expect(exited).toContain('next bash call starts from the workspace')
+    expect(text(await execute('after-exit', 'printf "%s\\n" "$PWD"'))).toBe(root)
+  }, 20_000)
+})

packages/pty/tool-bash-persistent/tests/tools.spec.ts

@@ -0,0 +1,538 @@
+import { afterEach, describe, expect, it } from 'vitest'
+import { Context } from 'cordis'
+import { CallId } from '@deepseek-ai/dsh-llm'
+import { Session, SessionId } from '@deepseek-ai/dsh-session'
+import AgentRegistry from '@deepseek-ai/dsh-agent'
+import type { Agent } from '@deepseek-ai/dsh-agent'
+import PtyService from '@deepseek-ai/dsh-pty'
+import type {
+  PtyBackend,
+  PtyBackendSession,
+  PtyReadRequest,
+  PtySendOperation,
+  PtySendRequest,
+  PtySessionStatus,
+  PtySignal,
+  PtyWaitReason,
+} from '@deepseek-ai/dsh-pty'
+import SystemPrompt from '@deepseek-ai/dsh-system-prompt'
+import ToolRegistry from '@deepseek-ai/dsh-tools'
+import * as ToolBashPersistent from '@deepseek-ai/dsh-tool-bash-persistent'
+
+const contexts: Context[] = []
+let callNumber = 0
+
+afterEach(async () => {
+  for (const ctx of contexts.splice(0)) await ctx.fiber.dispose()
+})
+
+function agent(ctx: Context, cwd: string | undefined): Agent {
+  const id = SessionId(`persistent-bash-owner-${callNumber}`)
+  const scope = ctx.plugin(() => {})
+  const value: Agent = {
+    id,
+    options: {},
+    session: new Session(id, [], {
+      version: 0,
+      id,
+      createdAt: 0,
+      ...cwd === undefined ? {} : { cwd },
+    }),
+    status: 'idle',
+    acceptsNextStep: false,
+    ctx: scope.ctx,
+    followup: () => {},
+    steer: () => {},
+    inject: () => {},
+    send: () => {},
+    updateInbox: () => 'not-found',
+    cancel() {},
+    whenIdle: () => Promise.resolve(),
+  }
+  ctx.agents.register(value)
+  return value
+}
+
+function text(result: { content: { type: string; text?: string }[] }): string {
+  return result.content.filter(block => block.type === 'text').map(block => block.text).join('')
+}
+
+function call(
+  ctx: Context,
+  owner: Agent | undefined,
+  command: string,
+  signal = new AbortController().signal,
+) {
+  return ctx.tools.execute({
+    signal,
+    callId: CallId(`persistent-bash-${++callNumber}`),
+    name: 'bash',
+    arguments: { command },
+    ...owner === undefined ? {} : { agent: owner },
+  })
+}
+
+type StubMode =
+  | 'normal'
+  | 'prompt-only'
+  | 'prompt-crlf'
+  | 'empty-read'
+  | 'stalled-read'
+  | 'exit'
+  | 'signal-exit'
+  | 'unknown-exit'
+  | 'wait-for-abort'
+  | 'end-on-abort'
+  | 'idle-then-normal'
+  | 'large'
+  | 'nonzero'
+  | 'torn-status'
+  | 'finish-torn-status'
+  | 'end-only'
+  | 'init-exit'
+  | 'init-timeout'
+  | 'spawn-error'
+  | 'send-error'
+  | 'prompt-after-idle'
+  | 'empty-page-after-latest'
+
+class StubPtySession implements PtyBackendSession {
+  readonly motd = '__DSH_PERSISTENT_BASH_PROMPT__ '
+  readonly pid = 123
+  statusValue: PtySessionStatus = { kind: 'running' }
+  scrollback = this.motd
+  closed: string[] = []
+  mode: StubMode
+  sends = 0
+  pendingText = ''
+  historyTruncated = false
+
+  constructor(mode: StubMode) {
+    this.mode = mode
+  }
+
+  startSend(request: PtySendRequest): PtySendOperation {
+    this.sends += 1
+    if (request.text.startsWith('stty -echo')) {
+      if (this.mode === 'init-exit') {
+        this.statusValue = { kind: 'exited', exitCode: 1, signal: null }
+        return this.operation(Promise.resolve(this.result('', 'session_exit')))
+      }
+      if (this.mode === 'init-timeout') {
+        return this.operation(Promise.resolve(this.result('', 'timeout')))
+      }
+      return this.operation(Promise.resolve(this.result(this.motd, 'stdin_read')))
+    }
+    if (this.mode === 'send-error') throw new Error('stub send failed')
+    if (this.mode === 'wait-for-abort' || this.mode === 'end-on-abort') {
+      const done = new Promise<ReturnType<StubPtySession['result']>>((resolve) => {
+        request.signal?.addEventListener('abort', () => {
+          const start = /__DSH_PERSISTENT_BASH_START_[^_]+(?:-[^_]+)*__/.exec(request.text)?.[0]
+          const end = /__DSH_PERSISTENT_BASH_END_[^:]+:/.exec(request.text)?.[0]
+          const output = this.mode === 'end-on-abort'
+            ? `${start ?? ''}\ninterrupted\n${end ?? ''}130\n${this.motd}`
+            : 'partial output'
+          this.scrollback += output
+          resolve(this.result(output, 'stdin_read'))
+        }, { once: true })
+      })
+      return this.operation(done)
+    }
+    if (this.mode === 'idle-then-normal') {
+      this.mode = 'normal'
+      this.pendingText = request.text
+      return this.operation(Promise.resolve(this.result('', 'inferred_idle')))
+    }
+    if (this.mode === 'prompt-after-idle') {
+      if (request.text.length > 0) {
+        const start = /__DSH_PERSISTENT_BASH_START_[^_]+(?:-[^_]+)*__/.exec(request.text)?.[0]
+        const output = `${start ?? ''}\npartial syntax output\n`
+        this.scrollback += output
+        return this.operation(Promise.resolve(this.result(output, 'inferred_idle')))
+      }
+      const output = `bash: syntax error\n${this.motd}`
+      this.scrollback += output
+      return this.operation(Promise.resolve(this.result(output, 'stdin_read')))
+    }
+    if (this.mode === 'prompt-only' || this.mode === 'prompt-crlf') {
+      const newline = this.mode === 'prompt-crlf' ? '\r\n' : '\n'
+      const output = `bash: syntax error${newline}${this.motd}${newline}`
+      this.scrollback += output
+      return this.operation(Promise.resolve(this.result(output, 'stdin_read')))
+    }
+    const sent = request.text.length > 0 ? request.text : this.pendingText
+    this.pendingText = ''
+    const start = /__DSH_PERSISTENT_BASH_START_[^_]+(?:-[^_]+)*__/.exec(sent)?.[0]
+    const end = /__DSH_PERSISTENT_BASH_END_[^:]+:/.exec(sent)?.[0]
+    if (this.mode === 'torn-status') {
+      const output = `${start ?? ''}\nhello from stub\n${end ?? ''}`
+      this.scrollback += output
+      this.mode = 'finish-torn-status'
+      return this.operation(Promise.resolve(this.result(output, 'inferred_idle')))
+    }
+    if (this.mode === 'finish-torn-status') {
+      const output = `7\n${this.motd}`
+      this.scrollback += output
+      return this.operation(Promise.resolve(this.result(output, 'stdin_read')))
+    }
+    if (this.mode === 'end-only') {
+      const output = `recovered output\n${end ?? ''}0\n${this.motd}`
+      this.scrollback += output
+      return this.operation(Promise.resolve(this.result(output, 'stdin_read')))
+    }
+    const commandOutput = this.mode === 'large'
+      ? 'x'.repeat(100)
+      : this.mode === 'nonzero' ? '' : 'hello from stub'
+    const exitCode = this.mode === 'nonzero' ? 7 : 0
+    const output = `${start ?? ''}\n${commandOutput}\n${end ?? ''}${exitCode}\n${this.motd}`
+    this.scrollback += output
+    if (this.mode === 'exit' || this.mode === 'signal-exit' || this.mode === 'unknown-exit') {
+      const exitedOutput = `${start ?? ''}\nhello from stub\n`
+      this.scrollback = this.scrollback.slice(0, -output.length) + exitedOutput
+      this.statusValue = this.mode === 'signal-exit'
+        ? { kind: 'exited', exitCode: null, signal: 'SIGTERM' }
+        : this.mode === 'exit'
+          ? { kind: 'exited', exitCode: 9, signal: null }
+          : { kind: 'exited', exitCode: null, signal: null }
+      return this.operation(Promise.resolve(this.result(exitedOutput, 'session_exit')))
+    }
+    return this.operation(Promise.resolve(this.result(output, 'stdin_read')))
+  }
+
+  read(request: PtyReadRequest) {
+    if (this.mode === 'empty-read') {
+      return { text: '', totalLines: 0, lineBegin: 0, lineEnd: 0, truncated: false }
+    }
+    if (this.mode === 'stalled-read') {
+      return { text: 'stalled', totalLines: 1, lineBegin: 0, lineEnd: 0, truncated: false }
+    }
+    if (this.mode === 'empty-page-after-latest' && (request.offset ?? 0) > 0) {
+      return { text: '', totalLines: 2, lineBegin: 1, lineEnd: 1, truncated: false }
+    }
+    const lines = this.scrollback.split('\n')
+    return {
+      text: this.scrollback,
+      totalLines: this.mode === 'empty-page-after-latest' ? lines.length + 1 : lines.length,
+      lineBegin: 0,
+      lineEnd: this.mode === 'empty-page-after-latest' ? 1 : lines.length,
+      truncated: this.historyTruncated,
+    }
+  }
+
+  signal(_signal: PtySignal) {
+    return Promise.resolve({ delivered: true as const, targetPgid: 123 })
+  }
+
+  status() {
+    return this.statusValue
+  }
+
+  async close(reason: string) {
+    this.closed.push(reason)
+    this.statusValue = { kind: 'exited', exitCode: 0, signal: null }
+  }
+
+  private result(viewport: string, waitReason: PtyWaitReason) {
+    return { viewport, waitReason, sessionStatus: this.statusValue, truncated: false }
+  }
+
+  private operation(done: Promise<ReturnType<StubPtySession['result']>>): PtySendOperation {
+    return {
+      done,
+      readOutput: () => ({ delta: '', truncated: false }),
+      cancel: () => false,
+    }
+  }
+}
+
+function stubBackend(initialMode: StubMode = 'normal') {
+  const sessions: StubPtySession[] = []
+  const backend: PtyBackend = {
+    type: 'stub',
+    async spawn() {
+      if (initialMode === 'spawn-error') throw new Error('stub spawn failed')
+      const session = new StubPtySession(initialMode)
+      sessions.push(session)
+      return session
+    },
+  }
+  return { backend, sessions }
+}
+
+async function setup(
+  config: ToolBashPersistent.Config = { backendType: 'stub' },
+  initialMode: StubMode = 'normal',
+) {
+  const ctx = new Context()
+  contexts.push(ctx)
+  await ctx.plugin(SystemPrompt)
+  await ctx.plugin(ToolRegistry)
+  await ctx.plugin(AgentRegistry)
+  await ctx.plugin(PtyService)
+  const stub = stubBackend(initialMode)
+  ctx.pty.registerBackend(stub.backend)
+  const fiber = await ctx.plugin(ToolBashPersistent, config)
+  return { ctx, stub, fiber, owner: agent(ctx, '/workspace') }
+}
+
+describe('tool-bash-persistent', () => {
+  it('registers a configurable schema and reuses one owner shell', async () => {
+    const { ctx, owner, stub, fiber } = await setup({
+      backendType: 'stub',
+      description: 'deployment-specific persistent shell',
+    })
+    const schema = ctx.tools.schemas()[0]
+    expect(ctx.tools.schemas().map(item => item.name)).toEqual(['bash'])
+    expect(schema?.description).toBe('deployment-specific persistent shell')
+    expect(schema?.parameters).toMatchObject({
+      required: ['command'],
+      properties: { command: { type: 'string' } },
+    })
+    expect(ctx.tools.get('bash')?.presentCall?.({ command: 'pwd' }))
+      .toEqual({ card: 'terminal', title: 'pwd' })
+
+    expect(text(await call(ctx, owner, 'echo one'))).toBe('hello from stub')
+    expect(text(await call(ctx, owner, 'echo two'))).toBe('hello from stub')
+    expect(stub.sessions).toHaveLength(1)
+    expect(stub.sessions[0]?.sends).toBe(3)
+
+    const ownerWithoutCwd = agent(ctx, undefined)
+    expect(text(await call(ctx, ownerWithoutCwd, 'pwd'))).toBe('hello from stub')
+    expect(stub.sessions).toHaveLength(2)
+
+    await fiber.dispose()
+    expect(ctx.tools.schemas()).toEqual([])
+    expect(ctx.tools.get('bash')).toBeUndefined()
+  })
+
+  it('handles inferred idle, prompt fallback, shell exit, clipping, and cleanup', async () => {
+    const { ctx, owner, stub, fiber } = await setup({
+      backendType: 'stub',
+      maxOutputChars: 10,
+    })
+    await call(ctx, owner, 'warm up')
+    const session = stub.sessions[0]!
+
+    session.mode = 'idle-then-normal'
+    expect(text(await call(ctx, owner, 'silent then complete'))).toContain('hello from')
+
+    session.mode = 'prompt-only'
+    const promptFallback = text(await call(ctx, owner, 'bad {'))
+    expect(promptFallback).toContain('bash: synt')
+    expect(promptFallback).not.toContain('DSH_PERSISTENT_BASH_PROMPT')
+
+    session.mode = 'prompt-crlf'
+    session.scrollback = ''
+    const crlfPromptFallback = text(await call(ctx, owner, 'bad {'))
+    expect(crlfPromptFallback).toContain('bash: synt')
+    expect(crlfPromptFallback).not.toContain('DSH_PERSISTENT_BASH_PROMPT')
+
+    session.mode = 'end-only'
+    session.scrollback = ''
+    const missingStart = text(await call(ctx, owner, 'recover marker'))
+    expect(missingStart).toContain('recovered')
+    expect(missingStart).toContain('beginning of this command output was dropped')
+    expect(missingStart).toContain('<response clipped>')
+
+    session.mode = 'large'
+    expect(text(await call(ctx, owner, 'large'))).toContain('<response clipped>')
+
+    session.mode = 'nonzero'
+    expect(text(await call(ctx, owner, 'false'))).toBe('[exit code: 7]')
+
+    session.mode = 'exit'
+    const exited = text(await call(ctx, owner, 'exit'))
+    expect(exited).toContain('hello from')
+    expect(exited).toContain('[shell exited: code 9]')
+    expect(exited).not.toContain('[exit code: 9]')
+    expect(exited).toContain('next bash call starts from the workspace')
+    expect(session.closed).toContain('persistent bash shell exited')
+
+    await call(ctx, owner, 'new shell')
+    expect(stub.sessions).toHaveLength(2)
+    const replacement = stub.sessions[1]!
+    replacement.mode = 'signal-exit'
+    expect(text(await call(ctx, owner, 'kill shell')))
+      .toContain('[shell killed by signal: SIGTERM]')
+
+    await call(ctx, owner, 'another shell')
+    expect(stub.sessions).toHaveLength(3)
+    const externallyClosed = ctx.pty.list(owner)[0]?.sessionId
+    expect(externallyClosed).toBeDefined()
+    await ctx.pty.kill(owner, externallyClosed!, 'external cleanup')
+    await fiber.dispose()
+    expect(stub.sessions[2]?.closed).toEqual(['external cleanup'])
+  })
+
+  it('waits for status digits after a torn completion marker', async () => {
+    const { ctx, owner, stub } = await setup({ backendType: 'stub', maxOutputChars: 1_000 })
+    await call(ctx, owner, 'warm up')
+    stub.sessions[0]!.mode = 'torn-status'
+    stub.sessions[0]!.scrollback = ''
+
+    expect(text(await call(ctx, owner, 'torn status'))).toBe('hello from stub\n[exit code: 7]')
+  })
+
+  it('reports a shell exit when the backend has no code or signal', async () => {
+    const { ctx, owner, stub } = await setup({ backendType: 'stub' })
+    await call(ctx, owner, 'warm up')
+    stub.sessions[0]!.mode = 'unknown-exit'
+
+    expect(text(await call(ctx, owner, 'exit without status'))).toContain('[shell exited]')
+  })
+
+  it('marks a short missing-prefix result and tolerates exhausted scrollback pages', async () => {
+    const { ctx, owner, stub } = await setup({ backendType: 'stub', maxOutputChars: 1_000 })
+    await call(ctx, owner, 'warm up')
+    const session = stub.sessions[0]!
+
+    session.mode = 'end-only'
+    session.scrollback = ''
+    expect(text(await call(ctx, owner, 'missing start')))
+      .toContain('beginning of this command output was dropped')
+
+    session.mode = 'empty-read'
+    expect(text(await call(ctx, owner, 'empty page'))).toContain('hello from stub')
+
+    session.mode = 'stalled-read'
+    expect(text(await call(ctx, owner, 'stalled page'))).toContain('hello from stub')
+
+    session.mode = 'empty-page-after-latest'
+    expect(text(await call(ctx, owner, 'empty continuation page'))).toContain('hello from stub')
+  })
+
+  it('sanitizes a prompt fallback reached after multiple polling rounds', async () => {
+    const { ctx, owner, stub } = await setup({ backendType: 'stub', maxOutputChars: 1_000 })
+    await call(ctx, owner, 'warm up')
+    const session = stub.sessions[0]!
+    session.mode = 'prompt-after-idle'
+    session.scrollback = ''
+    const result = text(await call(ctx, owner, 'bad {'))
+    expect(result).toContain('partial syntax output')
+    expect(result).toContain('bash: syntax error')
+    expect(result).not.toContain('DSH_PERSISTENT_BASH_PROMPT')
+    expect(result).not.toContain('DSH_PERSISTENT_BASH_START')
+  })
+
+  it('does not attribute old scrollback truncation to a complete current command', async () => {
+    const { ctx, owner, stub } = await setup({ backendType: 'stub', maxOutputChars: 1_000 })
+    await call(ctx, owner, 'warm up')
+    stub.sessions[0]!.historyTruncated = true
+    const result = text(await call(ctx, owner, 'short command'))
+    expect(result).toBe('hello from stub')
+    expect(result).not.toContain('<response clipped>')
+    expect(result).not.toContain('beginning of this command output was dropped')
+  })
+
+  it('closes a timed-out shell and reports bounded partial output', async () => {
+    const { ctx, owner, stub } = await setup({ backendType: 'stub', timeoutMs: 10 })
+    await call(ctx, owner, 'warm up')
+    stub.sessions[0]!.mode = 'wait-for-abort'
+    const result = await call(ctx, owner, 'hang')
+    expect(text(result)).toContain('timed out after 0 seconds or experienced an OOM error')
+    expect(text(result)).toContain('partial output')
+    expect(text(result)).toContain('next bash call starts from the workspace')
+    expect(stub.sessions[0]?.closed).toContain('persistent bash command timed out')
+  })
+
+  it.each(['wait-for-abort', 'end-on-abort'] as const)(
+    'cancels %s work, resets the shell, and releases a queued call',
+    async (mode) => {
+      const { ctx, owner, stub } = await setup({ backendType: 'stub', timeoutMs: 5_000 })
+      await call(ctx, owner, 'warm up')
+      stub.sessions[0]!.mode = mode
+      const controller = new AbortController()
+      const cancelled = call(ctx, owner, 'hang', controller.signal)
+      const queued = call(ctx, owner, 'after cancellation')
+      setTimeout(() => {
+        controller.abort(new Error('caller stopped'))
+      }, 5)
+
+      expect((await cancelled).isError).toBe(true)
+      expect(text(await queued)).toBe('hello from stub')
+      expect(stub.sessions[0]?.closed).toContain('persistent bash command aborted')
+      expect(stub.sessions).toHaveLength(2)
+    },
+  )
+
+  it.each(['init-exit', 'init-timeout'] as const)(
+    'fails initialization and closes the unusable shell for %s',
+    async (mode) => {
+      const { ctx, owner, stub } = await setup({ backendType: 'stub' }, mode)
+      expect((await call(ctx, owner, 'pwd')).isError).toBe(true)
+      expect(stub.sessions[0]?.closed).toContain('persistent bash initialization failed')
+    },
+  )
+
+  it('clears a failed spawn without trying to close an unpublished shell', async () => {
+    const { ctx, owner, stub } = await setup({ backendType: 'stub' }, 'spawn-error')
+    expect((await call(ctx, owner, 'pwd')).isError).toBe(true)
+    expect(stub.sessions).toHaveLength(0)
+  })
+
+  it('resets a cached shell after startSend fails', async () => {
+    const { ctx, owner, stub } = await setup()
+    await call(ctx, owner, 'warm up')
+    stub.sessions[0]!.mode = 'send-error'
+    expect((await call(ctx, owner, 'fails')).isError).toBe(true)
+    expect(stub.sessions[0]?.closed).toContain('persistent bash send failed')
+    expect(text(await call(ctx, owner, 'recovers'))).toBe('hello from stub')
+    expect(stub.sessions).toHaveLength(2)
+  })
+
+  it('cancels and awaits a pending shell spawn when the plugin is disposed', async () => {
+    const ctx = new Context()
+    contexts.push(ctx)
+    await ctx.plugin(SystemPrompt)
+    await ctx.plugin(ToolRegistry)
+    await ctx.plugin(AgentRegistry)
+    await ctx.plugin(PtyService)
+    const spawnStarted = Promise.withResolvers<undefined>()
+    const spawnAborted = Promise.withResolvers<undefined>()
+    ctx.pty.registerBackend({
+      type: 'slow',
+      spawn: spec => new Promise((_resolve, reject) => {
+        spawnStarted.resolve(undefined)
+        spec.signal?.addEventListener('abort', () => {
+          spawnAborted.resolve(undefined)
+          const reason: unknown = spec.signal?.reason
+          reject(reason instanceof Error
+            ? reason
+            : new Error('slow PTY spawn aborted', { cause: reason }))
+        }, { once: true })
+      }),
+    })
+    const fiber = await ctx.plugin(ToolBashPersistent, { backendType: 'slow' })
+    const owner = agent(ctx, '/workspace')
+    const running = call(ctx, owner, 'pwd')
+    await spawnStarted.promise
+    await fiber.dispose()
+    await spawnAborted.promise
+    expect((await running).isError).toBe(true)
+    expect(ctx.pty.list(owner)).toEqual([])
+  })
+
+  it('rejects invalid config and invalid calls', async () => {
+    const { ctx, owner, stub } = await setup()
+    expect((await call(ctx, undefined, 'pwd')).isError).toBe(true)
+    expect(text(await call(ctx, owner, ' '))).toContain('command must be a non-empty string')
+
+    const controller = new AbortController()
+    controller.abort(new Error('caller stopped'))
+    expect((await call(ctx, owner, 'pwd', controller.signal)).isError).toBe(true)
+    expect(stub.sessions).toHaveLength(0)
+
+    expect(() => {
+      ToolBashPersistent.apply(new Context(), { backendType: '' })
+    }).toThrow('backendType must be non-empty')
+    expect(() => {
+      ToolBashPersistent.apply(new Context(), { timeoutMs: 0 })
+    }).toThrow('timeoutMs must be a positive safe integer')
+    expect(() => {
+      ToolBashPersistent.apply(new Context(), { maxOutputChars: 0 })
+    }).toThrow('maxOutputChars must be a positive safe integer')
+    expect(() => {
+      ToolBashPersistent.apply(new Context(), { description: ' ' })
+    }).toThrow('description must be non-empty')
+  })
+})

packages/pty/tool-bash-persistent/tsconfig.json

@@ -0,0 +1,16 @@
+{
+  "extends": "../../../tsconfig.base.json",
+  "compilerOptions": {
+    "rootDir": "src",
+    "outDir": "lib/types"
+  },
+  "include": ["src"],
+  "references": [
+    { "path": "../../../vendor/cordis" },
+    { "path": "../../core/agent" },
+    { "path": "../../core/tools" },
+    { "path": "../pty" },
+    { "path": "../../support/invariants" },
+    { "path": "../../util/timeout" }
+  ]
+}

packages/session-persistence/session-persistence-jsonl/tests/jsonl.spec.ts

@@ -378,7 +378,9 @@ describe('SessionPersistenceJsonl: durability and crash semantics', () => {
     await ctx.sessions.flush(child)
     const loaded = await ctx.sessionPersistence.load(child.id)
 
-    expect(loaded.events).toEqual(source.events)
+    // The constructor seed reaches disk verbatim, then the child's end-seed.
+    expect(loaded.events.slice(0, source.events.length)).toEqual(source.events)
+    expect(loaded.events.at(-1)).toMatchObject({ type: 'session/end-seed', seq: source.events.length })
     expect(loaded.meta).toMatchObject({
       id: SessionId('persist-child'),
       cwd: '/workspace',

packages/session-persistence/session-persistence/tests/coordinator-contract.ts

@@ -218,7 +218,9 @@ export function runCoordinatorContract(name: string, makeFixture: () => Promise<
         live.append('turn/end', { turn: 1, reason: { kind: 'completed' } })
         await ctx.sessions.flush(live)
         const loaded = await ctx.sessionPersistence.load(id)
-        expect(loaded.events.map(event => event.type)).toEqual(['turn/start', 'turn/end'])
+        // The constructor's end-seed event persisted between the stored
+        // turn/start and the turn/end appended live.
+        expect(loaded.events.map(event => event.type)).toEqual(['turn/start', 'session/end-seed', 'turn/end'])
         expect(loaded.events.at(-1)).toMatchObject({
           type: 'turn/end',
           data: { reason: { kind: 'completed' } },
@@ -477,11 +479,14 @@ export function runCoordinatorContract(name: string, makeFixture: () => Promise<
         const forked = ctx.sessions.create(SessionId('forked'), { seed, meta: { cwd: WORK } })
         await ctx.sessions.flush(forked) // onCreated persisted the seed
         const loaded = await ctx.sessionPersistence.load(SessionId('forked'))
-        expect(loaded.events).toEqual(seed)
+        // Fork is where the marker earns its keep: the inherited prefix may
+        // carry a bracket the still-running parent owns.
+        expect(loaded.events.slice(0, seed.length)).toEqual(seed)
+        expect(loaded.events.at(-1)).toMatchObject({ type: 'session/end-seed', seq: seed.length })
         // A flush with no NEW events must not double-write.
         await ctx.sessions.flush(forked)
         const reloaded = await ctx.sessionPersistence.load(SessionId('forked'))
-        expect(reloaded.events).toEqual(seed)
+        expect(reloaded.events).toEqual(loaded.events)
       } finally {
         await fiber.dispose()
         await fix.cleanup()
@@ -510,7 +515,9 @@ export function runCoordinatorContract(name: string, makeFixture: () => Promise<
         await second.ctx.sessions.flush(s2)
 
         const reloaded = await second.ctx.sessionPersistence.load(SessionId('resumed'))
-        expect(reloaded.events.map(e => e.seq)).toEqual([0, 1, 2, 3, 4, 5, 6, 7])
+        // 0-5 the resumed seed, 6 end-seed, 7-8 the new turn.
+        expect(reloaded.events.map(e => e.seq)).toEqual([0, 1, 2, 3, 4, 5, 6, 7, 8])
+        expect(reloaded.events[6]).toMatchObject({ type: 'session/end-seed' })
       } finally {
         await second.fiber.dispose()
         await fix.cleanup()
@@ -791,7 +798,9 @@ export function runCoordinatorContract(name: string, makeFixture: () => Promise<
         const live = ctx.sessions.create(SessionId('lazy-claim'), { seed: oneTurnLog(), meta: { cwd: WORK } })
         await expect(ctx.sessions.flush(live)).resolves.toBeUndefined()
         const loaded = await ctx.sessionPersistence.load(SessionId('lazy-claim'))
-        expect(loaded.events.map(e => e.seq)).toEqual([0, 1, 2, 3, 4, 5])
+        // Seeded 0-5 plus the constructor's end-seed event at 6.
+        expect(loaded.events.map(e => e.seq)).toEqual([0, 1, 2, 3, 4, 5, 6])
+        expect(loaded.events.at(-1)).toMatchObject({ type: 'session/end-seed' })
       } finally {
         await fiber.dispose()
         await fix.cleanup()
@@ -844,7 +853,9 @@ export function runCoordinatorContract(name: string, makeFixture: () => Promise<
         }, { inject: ['sessions'] }))
         await ctx.sessions.flush(cont)
         const loaded = await ctx.sessionPersistence.load(SessionId('claim'))
-        expect(loaded.events.map(e => e.seq)).toEqual([0, 1, 2, 3, 4, 5, 6, 7])
+        // 6-7 the claimed suffix; 8 end-seed after the whole seed.
+        expect(loaded.events.map(e => e.seq)).toEqual([0, 1, 2, 3, 4, 5, 6, 7, 8])
+        expect(loaded.events.at(-1)).toMatchObject({ type: 'session/end-seed' })
         expect(loaded.meta).toEqual(durableMeta)
         expect(loaded.meta.createdAt).toBe(1000)
 

packages/session-query/session-query-sqlite/tests/sqlite.spec.ts

@@ -1077,8 +1077,9 @@ describe('SQLite reconciliation and source lifecycle', () => {
     await expect(ctx.sessionQuery.searchEvents({ sessionId: live.id, query: 'needle' }))
       .rejects.toThrow(expectCode('SESSION_QUERY_INDEX_FAILED'))
     db.exec('PRAGMA query_only = OFF')
+    // seq 2: one-event seed, end-seed, then the live message.
     await expect(ctx.sessionQuery.searchEvents({ sessionId: live.id, query: 'needle' }))
-      .resolves.toMatchObject({ items: [{ seq: 1 }] })
+      .resolves.toMatchObject({ items: [{ seq: 2 }] })
   })
 })
 

packages/session-title/session-title/tests/service-contracts.spec.ts

@@ -185,6 +185,8 @@ describe('SessionTitleService configuration and refresh boundaries', () => {
       'turn/start',
       'user/message',
       'turn/end',
+      // The seeded constructor's end-seed marker.
+      'session/end-seed',
       'session/title',
     ])
     expect(ctx.sessionTitle.get(session)?.messageSeqs).toEqual([source.seq])

packages/subagent/subagent-inprocess/tests/inheritance.spec.ts

@@ -126,9 +126,10 @@ describe('in-process policy inheritance', () => {
 
       expect(child.session.header.seedLength).toBe(1)
       expect(child.session.firstLiveSeq).toBe(seed.length)
+      // seq 1 is the constructor's end-seed marker.
       expect(child.session.events.filter(event => event.type === 'sandbox/mode')).toMatchObject([
         { seq: 0, data: { mode: 'workspace-write' } },
-        { seq: 1, data: { mode: 'read-only', source: 'delegation' } },
+        { seq: 2, data: { mode: 'read-only', source: 'delegation' } },
       ])
       await expect(readFile(blocked, 'utf8')).rejects.toMatchObject({ code: 'ENOENT' })
       expect(ctx.sandboxPolicy.overrideOf(child.session)).toBe('read-only')

packages/telemetry/session-telemetry/tests/telemetry.spec.ts

@@ -186,10 +186,12 @@ describe('TelemetryCoordinator adoption', () => {
 
     const seqs = backend.ledger().map(r => [r.attributes['session.id'], r.attributes['event.seq']])
     expect(seqs).toEqual(expect.arrayContaining([['seed-parent', 0], ['seed-parent', 1]]))
-    expect(seqs.filter(([id]) => id === 'seeded')).toEqual([['seeded', 2]])
+    // 2 end-seed, 3 turn/end: both this lifecycle's own writes, while
+    // inherited 0-1 stay with the parent stream.
+    expect(seqs.filter(([id]) => id === 'seeded')).toEqual([['seeded', 2], ['seeded', 3]])
   })
 
-  it('resume shape: a full-log seed exports nothing yet still rebuilds the chunk projection', async () => {
+  it('resume shape: a full-log seed exports only its own end-seed and rebuilds the chunk projection', async () => {
     const backend = new FakeBackend()
     const ctx = new Context()
     await ctx.plugin(SessionStore)
@@ -205,14 +207,16 @@ describe('TelemetryCoordinator adoption', () => {
     const ofResumed = () => backend.ledger()
       .filter(r => r.attributes['session.id'] === 'resumed')
       .map(r => r.attributes['event.seq'])
-    expect(ofResumed()).toEqual([])
+    // Nothing inherited is re-exported; seq 2 is this session's own first
+    // write — the end-seed event its constructor appended after the seed.
+    expect(ofResumed()).toEqual([2])
     // The seed fed the projection: the (turn 1, step 1) first chunk already
     // shipped from the original process, so its continuation is re-dropped…
     resumed.append('assistant/chunk', { turn: 1, step: 1, chunk: { type: 'text-delta', index: 0, text: 'continuation' } })
-    expect(ofResumed()).toEqual([])
+    expect(ofResumed()).toEqual([2])
     // …while a new step's first chunk exports normally.
     resumed.append('assistant/chunk', { turn: 1, step: 2, chunk: { type: 'text-delta', index: 0, text: 'next step' } })
-    expect(ofResumed()).toEqual([3])
+    expect(ofResumed()).toEqual([2, 4])
   })
 
   it('stamps session.seed_length from the header so receivers can stitch fork streams', async () => {

packages/ui/tui/src/components/dialogs.ts

@@ -23,6 +23,7 @@ import {
   type AgentLlmTarget,
 } from '@deepseek-ai/dsh-agent'
 import type { LlmModelInfo, LlmModelReasoningInfo, ReasoningEffortId } from '@deepseek-ai/dsh-llm'
+import { lastActivityTime } from '@deepseek-ai/dsh-session'
 import type { SessionId } from '@deepseek-ai/dsh-session'
 import { foldGoal, type GoalPhase } from '@deepseek-ai/dsh-goal'
 import { foldSessionTitle } from '@deepseek-ai/dsh-session-title'
@@ -512,7 +513,8 @@ export function summarizeResumeCandidate(
   return {
     record,
     title,
-    lastActivityAt: snapshot.events.at(-1)?.time ?? snapshot.session.createdAt,
+    // Excludes a prior pickup's boundary, or every browsed session floats up.
+    lastActivityAt: lastActivityTime(snapshot.events) ?? snapshot.session.createdAt,
     lastTurn: resumeTurnLabel(snapshot),
     currentWorkspace: record.header.cwd === cwd,
     workspaceLabel: formatWorkspace(record.header.cwd),